[Kamailio-Users-ES] Fallo al transferir llamadas externas

Jose Fernandez jose.fernandez at daikon.es
Thu Oct 2 13:22:43 CEST 2008 

¿Algún alma caritativa que me pueda echar una mano...?

Jose Fernandez escribió:
> Hola.
>
> Tengo una instalación con FXO Grandstream y Openser con varios teléfonos 
> IP registrados, y el problema que tengo es que las llamadas que entran a 
> través del FXO, al transferirlas entre teléfonos IP se cortan. No se 
> pueden transferir llamadas externas entre teléfonos IP. Sin embargo con 
> las llamadas internas entre los propios teléfonos IP no hay ningún 
> problema para transferirlas. Este problema ha surgido a raíz de cambiar 
> el modo de funcionamiento del FXO para que las llamadas entrantes suenen 
> directamente en los teléfonos IP. Con la configuración anterior según la 
> cual cuando entraba la llamada en el FXO era necesario una segunda 
> marcación para seleccionar la extensión IP, la transferencia de llamadas 
> funcionaba correctamente.
>
> ¿Me puede por favor echar alguien una mano a identificar la causa del 
> corte en las transferencias? Muchas gracias de antemano.
>
> Adjunto traza ngrep, de una llamada externa entrante a la extensión 43 a 
> través del canal FXO 9873, y el intento de transferencia de esta llamada 
> desde la extensión 43 hacia la extensión 42. La traza a partir de 
> haberse atendido ya la llamada externa en la extensión 42.
>
>
> #
> U 2008/09/19 14:30:19.983100 192.168.20.13:5060 -> 192.168.20.1:5060
> INVITE sip:42 at 192.168.20.1:5060 SIP/2.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 70
> Supported: replaces
> User-Agent: Voip Phone 1.0
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, 
> SUBSCRIBE, PRACK, UPDATE
> Content-Type: application/sdp
> Content-Length: 313
>  
> v=0
> o=43 32364100 22806179 IN IP4 192.168.20.13
> s=A conversation
> c=IN IP4 192.168.20.13
> t=0 0
> m=audio 10320 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendrecv
>
> #
> U 2008/09/19 14:30:19.984128 192.168.20.1:5060 -> 192.168.20.13:5060
> SIP/2.0 100 trying -- your call is important to us
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport=5060
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Server: OpenSer (1.1.1-notls (i386/linux))
> Content-Length: 0
> Warning: 392 192.168.20.1:5060 "Noisy feedback tells:  pid=1627 
> req_src_ip=192.168.20.13 req_src_port=5060 
> in_uri=sip:42 at 192.168.20.1:5060 out_uri=sip:42 at 192.168.20.12:5060 
> via_cnt==1"
>  
>
> #
> U 2008/09/19 14:30:19.984308 192.168.20.1:5060 -> 192.168.20.12:5060
> INVITE sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKb676.d21cd317.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport=5060
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 69
> Supported: replaces
> User-Agent: Voip Phone 1.0
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, 
> SUBSCRIBE, PRACK, UPDATE
> Content-Type: application/sdp
> Content-Length: 313
> P-hint: usrloc applied
>  
> v=0
> o=43 32364100 22806179 IN IP4 192.168.20.13
> s=A conversation
> c=IN IP4 192.168.20.13
> t=0 0
> m=audio 10320 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendrecv
>
> #
> U 2008/09/19 14:30:20.202511 192.168.20.1:5060 -> 192.168.20.12:5060
> INVITE sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKb676.d21cd317.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport=5060
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 69
> Supported: replaces
> User-Agent: Voip Phone 1.0
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, 
> SUBSCRIBE, PRACK, UPDATE
> Content-Type: application/sdp
> Content-Length: 313
> P-hint: usrloc applied
>  
> v=0
> o=43 32364100 22806179 IN IP4 192.168.20.13
> s=A conversation
> c=IN IP4 192.168.20.13
> t=0 0
> m=audio 10320 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendrecv
>
> #
> U 2008/09/19 14:30:20.205681 192.168.20.12:5060 -> 192.168.20.1:5060
> SIP/2.0 100 Trying
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKb676.d21cd317.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:20.226804 192.168.20.12:5060 -> 192.168.20.1:5060
> SIP/2.0 180 Ringing
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKb676.d21cd317.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:20.227247 192.168.20.1:5060 -> 192.168.20.13:5060
> SIP/2.0 180 Ringing
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:20.298327 192.168.20.12:5060 -> 192.168.20.1:5060
> SIP/2.0 180 Ringing
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKb676.d21cd317.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:20.299019 192.168.20.1:5060 -> 192.168.20.13:5060
> SIP/2.0 180 Ringing
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:23.142771 192.168.20.12:5060 -> 192.168.20.1:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKb676.d21cd317.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Supported: replaces
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, 
> UPDATE, MESSAGE
> Content-Type: application/sdp
> Content-Length: 334
>  
> v=0
> o=42 13188124 91532501 IN IP4 192.168.20.12
> s=A conversation
> c=IN IP4 192.168.20.12
> t=0 0
> m=audio 10176 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=fmtp:18 annexb=no
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendrecv
>
> #
> U 2008/09/19 14:30:23.143540 192.168.20.1:5060 -> 192.168.20.13:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK26887157682213617086;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Supported: replaces
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, 
> UPDATE, MESSAGE
> Content-Type: application/sdp
> Content-Length: 334
>  
> v=0
> o=42 13188124 91532501 IN IP4 192.168.20.12
> s=A conversation
> c=IN IP4 192.168.20.12
> t=0 0
> m=audio 10176 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=fmtp:18 annexb=no
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendrecv
>
> #
> U 2008/09/19 14:30:23.612392 192.168.20.13:5060 -> 192.168.20.1:5060
> ACK sip:42 at 192.168.20.12:5060 SIP/2.0
> Via: SIP/2.0/UDP 192.168.20.13:5060;branch=z9hG4bK2420243251744332345
> Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 ACK
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 70
> User-Agent: Voip Phone 1.0
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:23.613303 192.168.20.1:5060 -> 192.168.20.12:5060
> ACK sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKb676.d21cd317.2
> Via: SIP/2.0/UDP 192.168.20.13:5060;branch=z9hG4bK2420243251744332345
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 ACK
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 69
> User-Agent: Voip Phone 1.0
> Content-Length: 0
> P-hint: rr-enforced
>  
>
> #
> U 2008/09/19 14:30:27.150694 192.168.20.13:5060 -> 192.168.20.1:5060
> INVITE sip:42 at 192.168.20.12:5060 SIP/2.0
> Via: SIP/2.0/UDP 192.168.20.13:5060;branch=z9hG4bK2273717731513410102;rport
> Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 INVITE
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 70
> Supported: replaces
> User-Agent: Voip Phone 1.0
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, 
> SUBSCRIBE, PRACK, UPDATE
> Content-Type: application/sdp
> Content-Length: 307
>  
> v=0
> o=43 32364100 22806180 IN IP4 192.168.20.13
> s=A conversation
> c=IN IP4 0.0.0.0
> t=0 0
> m=audio 10320 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendonly
>
> #
> U 2008/09/19 14:30:27.151252 192.168.20.1:5060 -> 192.168.20.13:5060
> SIP/2.0 100 trying -- your call is important to us
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2273717731513410102;rport=5060
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 INVITE
> Server: OpenSer (1.1.1-notls (i386/linux))
> Content-Length: 0
> Warning: 392 192.168.20.1:5060 "Noisy feedback tells:  pid=1628 
> req_src_ip=192.168.20.13 req_src_port=5060 
> in_uri=sip:42 at 192.168.20.12:5060 out_uri=sip:42 at 192.168.20.12:5060 
> via_cnt==1"
>  
>
> #
> U 2008/09/19 14:30:27.151423 192.168.20.1:5060 -> 192.168.20.12:5060
> INVITE sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK8676.852fdee7.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2273717731513410102;rport=5060
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 INVITE
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 69
> Supported: replaces
> User-Agent: Voip Phone 1.0
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, 
> SUBSCRIBE, PRACK, UPDATE
> Content-Type: application/sdp
> Content-Length: 307
> P-hint: rr-enforced
>  
> v=0
> o=43 32364100 22806180 IN IP4 192.168.20.13
> s=A conversation
> c=IN IP4 0.0.0.0
> t=0 0
> m=audio 10320 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendonly
>
> #
> U 2008/09/19 14:30:27.209761 192.168.20.1:5060 -> 192.168.20.12:5060
> INVITE sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK8676.852fdee7.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2273717731513410102;rport=5060
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 INVITE
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 69
> Supported: replaces
> User-Agent: Voip Phone 1.0
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, 
> SUBSCRIBE, PRACK, UPDATE
> Content-Type: application/sdp
> Content-Length: 307
> P-hint: rr-enforced
>  
> v=0
> o=43 32364100 22806180 IN IP4 192.168.20.13
> s=A conversation
> c=IN IP4 0.0.0.0
> t=0 0
> m=audio 10320 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendonly
>
> #
> U 2008/09/19 14:30:27.406839 192.168.20.12:5060 -> 192.168.20.1:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK8676.852fdee7.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2273717731513410102;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Supported: replaces
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, 
> UPDATE, MESSAGE
> Content-Type: application/sdp
> Content-Length: 334
>  
> v=0
> o=42 22322225 14523311 IN IP4 192.168.20.12
> s=A conversation
> c=IN IP4 192.168.20.12
> t=0 0
> m=audio 10176 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=fmtp:18 annexb=no
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=recvonly
>
> #
> U 2008/09/19 14:30:27.407193 192.168.20.1:5060 -> 192.168.20.13:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2273717731513410102;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Supported: replaces
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, 
> UPDATE, MESSAGE
> Content-Type: application/sdp
> Content-Length: 334
>  
> v=0
> o=42 22322225 14523311 IN IP4 192.168.20.12
> s=A conversation
> c=IN IP4 192.168.20.12
> t=0 0
> m=audio 10176 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=fmtp:18 annexb=no
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=recvonly
>
> #
> U 2008/09/19 14:30:27.491887 192.168.20.12:5060 -> 192.168.20.1:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK8676.852fdee7.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2273717731513410102;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Supported: replaces
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, 
> UPDATE, MESSAGE
> Content-Type: application/sdp
> Content-Length: 334
>  
> v=0
> o=42 22322225 14523311 IN IP4 192.168.20.12
> s=A conversation
> c=IN IP4 192.168.20.12
> t=0 0
> m=audio 10176 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=fmtp:18 annexb=no
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=recvonly
>
> #
> U 2008/09/19 14:30:27.492279 192.168.20.1:5060 -> 192.168.20.13:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2273717731513410102;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Supported: replaces
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, 
> UPDATE, MESSAGE
> Content-Type: application/sdp
> Content-Length: 334
>  
> v=0
> o=42 22322225 14523311 IN IP4 192.168.20.12
> s=A conversation
> c=IN IP4 192.168.20.12
> t=0 0
> m=audio 10176 RTP/AVP 8 4 18 0 9 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:18 G729/8000
> a=fmtp:18 annexb=no
> a=rtpmap:0 PCMU/8000
> a=rtpmap:9 G722/16000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=recvonly
>
> #
> U 2008/09/19 14:30:27.539823 192.168.20.13:5060 -> 192.168.20.1:5060
> ACK sip:42 at 192.168.20.12:5060 SIP/2.0
> Via: SIP/2.0/UDP 192.168.20.13:5060;branch=z9hG4bK392818939904813707
> Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 ACK
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 70
> User-Agent: Voip Phone 1.0
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:27.540247 192.168.20.1:5060 -> 192.168.20.12:5060
> ACK sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK8676.852fdee7.2
> Via: SIP/2.0/UDP 192.168.20.13:5060;branch=z9hG4bK392818939904813707
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 ACK
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 69
> User-Agent: Voip Phone 1.0
> Content-Length: 0
> P-hint: rr-enforced
>  
>
> #
> U 2008/09/19 14:30:27.709861 192.168.20.13:5060 -> 192.168.20.1:5060
> ACK sip:42 at 192.168.20.12:5060 SIP/2.0
> Via: SIP/2.0/UDP 192.168.20.13:5060;branch=z9hG4bK392818939904813707
> Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 ACK
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 70
> User-Agent: Voip Phone 1.0
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:27.710267 192.168.20.1:5060 -> 192.168.20.12:5060
> ACK sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK8676.852fdee7.2
> Via: SIP/2.0/UDP 192.168.20.13:5060;branch=z9hG4bK392818939904813707
> From: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> To: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 2 ACK
> Contact: <sip:43 at 192.168.20.13:5060>
> Max-Forwards: 69
> User-Agent: Voip Phone 1.0
> Content-Length: 0
> P-hint: rr-enforced
>  
>
> #
> U 2008/09/19 14:30:27.762162 192.168.20.13:5060 -> 192.168.20.1:5060
> REFER sip:9873 at 192.168.10.2:5066;user=phone SIP/2.0
> Via: SIP/2.0/UDP 192.168.20.13:5060;branch=z9hG4bK183391788069093717;rport
> Route: <sip:192.168.20.1;lr=on;ftag=2478014423>
> From: <sip:43 at 192.168.20.1>;tag=2478014423
> To: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 2 REFER
> Contact: <sip:43 at 192.168.20.13:5060>
> refer-to: 
> <sip:42 at 192.168.20.1:5060?Replaces=66593269826955-13455355112414%40192.168.20.13%3Bto-tag%3D3026415234%3Bfrom-tag%3D1176531356> 
>
> referred-by: <sip:43 at 192.168.20.1>
> Max-Forwards: 70
> User-Agent: Voip Phone 1.0
> Event: refer
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:27.762693 192.168.20.1:5060 -> 192.168.10.2:5066
> REFER sip:9873 at 192.168.10.2:5066;user=phone SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=2478014423>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK6263.9c369da.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK183391788069093717;rport=5060
> From: <sip:43 at 192.168.20.1>;tag=2478014423
> To: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 2 REFER
> Contact: <sip:43 at 192.168.20.13:5060>
> refer-to: 
> <sip:42 at 192.168.20.1:5060?Replaces=66593269826955-13455355112414%40192.168.20.13%3Bto-tag%3D3026415234%3Bfrom-tag%3D1176531356> 
>
> referred-by: <sip:43 at 192.168.20.1>
> Max-Forwards: 69
> User-Agent: Voip Phone 1.0
> Event: refer
> Content-Length: 0
> P-hint: rr-enforced
>  
>
> #
> U 2008/09/19 14:30:27.859294 192.168.10.2:5066 -> 192.168.20.1:5060
> SIP/2.0 202 Accepted
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK6263.9c369da.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK183391788069093717;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=2478014423>
> From: <sip:43 at 192.168.20.1>;tag=2478014423
> To: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 2 REFER
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:6) 1.0.1.2
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Supported: replaces, timer, 100rel, path
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:27.859610 192.168.20.1:5060 -> 192.168.20.13:5060
> SIP/2.0 202 Accepted
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK183391788069093717;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=2478014423>
> From: <sip:43 at 192.168.20.1>;tag=2478014423
> To: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 2 REFER
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:6) 1.0.1.2
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Supported: replaces, timer, 100rel, path
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:27.880527 192.168.10.2:5066 -> 192.168.20.1:5060
> NOTIFY sip:43 at 192.168.20.13:5060 SIP/2.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK18161fe54437b433
> Route: <sip:192.168.20.1;lr=on;ftag=3d05668484314852>
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=3d05668484314852
> To: <sip:43 at 192.168.20.1>;tag=2478014423
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 10757 NOTIFY
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:6) 1.0.1.2
> Max-Forwards: 70
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Event: refer
> Subscription-State: active
> Content-Type: message/sipfrag;version=2.0
> Content-Length: 20 
>  
> SIP/2.0 100 Trying
>
> #
> U 2008/09/19 14:30:27.881054 192.168.20.1:5060 -> 192.168.20.13:5060
> NOTIFY sip:43 at 192.168.20.13:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=3d05668484314852>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKcd3.d84f00f3.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK18161fe54437b433
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=3d05668484314852
> To: <sip:43 at 192.168.20.1>;tag=2478014423
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 10757 NOTIFY
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:6) 1.0.1.2
> Max-Forwards: 69
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Event: refer
> Subscription-State: active
> Content-Type: message/sipfrag;version=2.0
> Content-Length: 20 
> P-hint: rr-enforced
>  
> SIP/2.0 100 Trying
>
> #
> U 2008/09/19 14:30:27.912377 192.168.10.2:5066 -> 192.168.20.1:5060
> INVITE sip:42 at 192.168.20.1:5060 SIP/2.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Replaces: 
> 66593269826955-13455355112414 at 192.168.20.13;to-tag=3026415234;from-tag=1176531356 
>
> Supported: replaces, timer, path
> Referred-By: <sip:43 at 192.168.20.1>
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 INVITE
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:7) 1.0.1.2
> Max-Forwards: 70
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Content-Type: application/sdp
> Content-Length: 235
>  
> v=0
> o=9873 8007 8000 IN IP4 192.168.10.2
> s=SIP Call
> c=IN IP4 192.168.10.2
> t=0 0
> m=audio 5032 RTP/AVP 8 0 101
> a=sendrecv
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=ptime:10
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-11
>
> #
> U 2008/09/19 14:30:27.912889 192.168.20.1:5060 -> 192.168.10.2:5066
> SIP/2.0 100 trying -- your call is important to us
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 INVITE
> Server: OpenSer (1.1.1-notls (i386/linux))
> Content-Length: 0
> Warning: 392 192.168.20.1:5060 "Noisy feedback tells:  pid=1626 
> req_src_ip=192.168.10.2 req_src_port=5066 
> in_uri=sip:42 at 192.168.20.1:5060 out_uri=sip:42 at 192.168.20.12:5060 
> via_cnt==1"
>  
>
> #
> U 2008/09/19 14:30:27.913010 192.168.20.1:5060 -> 192.168.20.12:5060
> INVITE sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKed4e.8b482304.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Replaces: 
> 66593269826955-13455355112414 at 192.168.20.13;to-tag=3026415234;from-tag=1176531356 
>
> Supported: replaces, timer, path
> Referred-By: <sip:43 at 192.168.20.1>
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 INVITE
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:7) 1.0.1.2
> Max-Forwards: 69
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Content-Type: application/sdp
> Content-Length: 235
> P-hint: usrloc applied
>  
> v=0
> o=9873 8007 8000 IN IP4 192.168.10.2
> s=SIP Call
> c=IN IP4 192.168.10.2
> t=0 0
> m=audio 5032 RTP/AVP 8 0 101
> a=sendrecv
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=ptime:10
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-11
>
> #
> U 2008/09/19 14:30:28.140252 192.168.20.13:5060 -> 192.168.20.1:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKcd3.d84f00f3.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK18161fe54437b433
> Record-Route: <sip:192.168.20.1;lr=on;ftag=3d05668484314852>
> From: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> To: <sip:43 at 192.168.20.1>;tag=2478014423
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 10757 NOTIFY
> Contact: <sip:43 at 192.168.20.13:5060>
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.140839 192.168.20.1:5060 -> 192.168.10.2:5066
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK18161fe54437b433
> Record-Route: <sip:192.168.20.1;lr=on;ftag=3d05668484314852>
> From: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> To: <sip:43 at 192.168.20.1>;tag=2478014423
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 10757 NOTIFY
> Contact: <sip:43 at 192.168.20.13:5060>
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.193697 192.168.20.13:5060 -> 192.168.20.1:5060
> BYE sip:9873 at 192.168.10.2:5066;user=phone SIP/2.0
> Via: SIP/2.0/UDP 192.168.20.13:5060;branch=z9hG4bK2144212896305094925;rport
> Route: <sip:192.168.20.1;lr=on;ftag=2478014423>
> From: <sip:43 at 192.168.20.1>;tag=2478014423
> To: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 3 BYE
> Max-Forwards: 70
> User-Agent: Voip Phone 1.0
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.194430 192.168.20.1:5060 -> 192.168.10.2:5066
> BYE sip:9873 at 192.168.10.2:5066;user=phone SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=2478014423>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK7263.af092c33.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2144212896305094925;rport=5060
> From: <sip:43 at 192.168.20.1>;tag=2478014423
> To: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 3 BYE
> Max-Forwards: 69
> User-Agent: Voip Phone 1.0
> Content-Length: 0
> P-hint: rr-enforced
>  
>
> #
> U 2008/09/19 14:30:28.210618 192.168.20.1:5060 -> 192.168.20.12:5060
> INVITE sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKed4e.8b482304.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Replaces: 
> 66593269826955-13455355112414 at 192.168.20.13;to-tag=3026415234;from-tag=1176531356 
>
> Supported: replaces, timer, path
> Referred-By: <sip:43 at 192.168.20.1>
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 INVITE
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:7) 1.0.1.2
> Max-Forwards: 69
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Content-Type: application/sdp
> Content-Length: 235
> P-hint: usrloc applied
>  
> v=0
> o=9873 8007 8000 IN IP4 192.168.10.2
> s=SIP Call
> c=IN IP4 192.168.10.2
> t=0 0
> m=audio 5032 RTP/AVP 8 0 101
> a=sendrecv
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=ptime:10
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-11
>
> #
> U 2008/09/19 14:30:28.211176 192.168.20.1:5060 -> 192.168.10.2:5066
> BYE sip:9873 at 192.168.10.2:5066;user=phone SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=2478014423>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK7263.af092c33.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2144212896305094925;rport=5060
> From: <sip:43 at 192.168.20.1>;tag=2478014423
> To: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 3 BYE
> Max-Forwards: 69
> User-Agent: Voip Phone 1.0
> Content-Length: 0
> P-hint: rr-enforced
>  
>
> #
> U 2008/09/19 14:30:28.286970 192.168.10.2:5066 -> 192.168.20.1:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK7263.af092c33.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2144212896305094925;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=2478014423>
> From: <sip:43 at 192.168.20.1>;tag=2478014423
> To: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 3 BYE
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:6) 1.0.1.2
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Supported: replaces, timer, 100rel, path
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.287776 192.168.20.1:5060 -> 192.168.20.13:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2144212896305094925;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=2478014423>
> From: <sip:43 at 192.168.20.1>;tag=2478014423
> To: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 3 BYE
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:6) 1.0.1.2
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Supported: replaces, timer, 100rel, path
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.326083 192.168.10.2:5066 -> 192.168.20.1:5060
> SIP/2.0 481 No Such Call
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK7263.af092c33.0
> Via: SIP/2.0/UDP 
> 192.168.20.13:5060;branch=z9hG4bK2144212896305094925;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=2478014423>
> From: <sip:43 at 192.168.20.1>;tag=2478014423
> To: unknown <sip:unknown at 192.168.20.1>;tag=3d05668484314852
> Call-ID: 4263e231cf65ba11 at 192.168.10.2
> CSeq: 3 BYE
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:0) 1.0.1.2
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.364322 192.168.20.12:5060 -> 192.168.20.1:5060
> SIP/2.0 100 Trying
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKed4e.8b482304.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> Record-Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> From: unknown <sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 INVITE
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.393542 192.168.20.12:5060 -> 192.168.20.1:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKed4e.8b482304.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> Record-Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> From: unknown <sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>;tag=983812395
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Supported: replaces
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, 
> UPDATE, MESSAGE
> Content-Type: application/sdp
> Content-Length: 238
>  
> v=0
> o=42 42889345 25269231 IN IP4 192.168.20.12
> s=A conversation
> c=IN IP4 192.168.20.12
> t=0 0
> m=audio 10178 RTP/AVP 8 0 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendrecv
>
> #
> U 2008/09/19 14:30:28.394149 192.168.20.1:5060 -> 192.168.10.2:5066
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> Record-Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> From: unknown <sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>;tag=983812395
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Supported: replaces
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, 
> UPDATE, MESSAGE
> Content-Type: application/sdp
> Content-Length: 238
>  
> v=0
> o=42 42889345 25269231 IN IP4 192.168.20.12
> s=A conversation
> c=IN IP4 192.168.20.12
> t=0 0
> m=audio 10178 RTP/AVP 8 0 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendrecv
>
> #
> U 2008/09/19 14:30:28.468273 192.168.20.12:5060 -> 192.168.20.1:5060
> BYE sip:43 at 192.168.20.13:5060 SIP/2.0
> Via: SIP/2.0/UDP 
> 192.168.20.12:5060;branch=z9hG4bK17746209931754612026;rport
> Route: <sip:192.168.20.1;lr=on;ftag=1176531356>
> From: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> To: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 BYE
> Max-Forwards: 70
> User-Agent: Voip Phone 1.0
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.469112 192.168.20.1:5060 -> 192.168.20.13:5060
> BYE sip:43 at 192.168.20.13:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=3026415234>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKb676.e21cd317.0
> Via: SIP/2.0/UDP 
> 192.168.20.12:5060;branch=z9hG4bK17746209931754612026;rport=5060
> From: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> To: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 BYE
> Max-Forwards: 69
> User-Agent: Voip Phone 1.0
> Content-Length: 0
> P-hint: rr-enforced
>  
>
> #
> U 2008/09/19 14:30:28.500801 192.168.10.2:5066 -> 192.168.20.1:5060
> CANCEL sip:42 at 192.168.20.12:5060 SIP/2.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>;tag=983812395
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 CANCEL
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:7) 1.0.1.2
> Max-Forwards: 70
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.501604 192.168.20.1:5060 -> 192.168.10.2:5066
> SIP/2.0 200 ok -- no more pending branches
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>;tag=983812395
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 CANCEL
> Server: OpenSer (1.1.1-notls (i386/linux))
> Content-Length: 0
> Warning: 392 192.168.20.1:5060 "Noisy feedback tells:  pid=1627 
> req_src_ip=192.168.10.2 req_src_port=5066 
> in_uri=sip:42 at 192.168.20.12:5060 out_uri=sip:42 at 192.168.20.12:5060 
> via_cnt==1"
>  
>
> #
> U 2008/09/19 14:30:28.506648 192.168.20.12:5060 -> 192.168.20.1:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKed4e.8b482304.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> Record-Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> From: unknown <sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>;tag=983812395
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Supported: replaces
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, 
> UPDATE, MESSAGE
> Content-Type: application/sdp
> Content-Length: 238
>  
> v=0
> o=42 42889345 25269231 IN IP4 192.168.20.12
> s=A conversation
> c=IN IP4 192.168.20.12
> t=0 0
> m=audio 10178 RTP/AVP 8 0 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendrecv
>
> #
> U 2008/09/19 14:30:28.507237 192.168.20.1:5060 -> 192.168.10.2:5066
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK2b17d6e34a56abe6
> Record-Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> From: unknown <sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>;tag=983812395
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 INVITE
> Contact: <sip:42 at 192.168.20.12:5060>
> Supported: replaces
> Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, 
> UPDATE, MESSAGE
> Content-Type: application/sdp
> Content-Length: 238
>  
> v=0
> o=42 42889345 25269231 IN IP4 192.168.20.12
> s=A conversation
> c=IN IP4 192.168.20.12
> t=0 0
> m=audio 10178 RTP/AVP 8 0 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendrecv
>
> #
> U 2008/09/19 14:30:28.521309 192.168.10.2:5066 -> 192.168.20.1:5060
> ACK sip:42 at 192.168.20.12:5060 SIP/2.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK8497d3318fc0bc45
> Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>;tag=983812395
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 ACK
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:7) 1.0.1.2
> Max-Forwards: 70
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.522076 192.168.20.1:5060 -> 192.168.20.12:5060
> ACK sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKed4e.8b482304.2
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bK8497d3318fc0bc45
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>;tag=983812395
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 ACK
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:7) 1.0.1.2
> Max-Forwards: 69
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Content-Length: 0
> P-hint: rr-enforced
>  
>
> #
> U 2008/09/19 14:30:28.638974 192.168.20.13:5060 -> 192.168.20.1:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKb676.e21cd317.0
> Via: SIP/2.0/UDP 
> 192.168.20.12:5060;branch=z9hG4bK17746209931754612026;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=3026415234>
> From: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> To: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 BYE
> Contact: <sip:43 at 192.168.20.13:5060>
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.639596 192.168.20.1:5060 -> 192.168.20.12:5060
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 
> 192.168.20.12:5060;branch=z9hG4bK17746209931754612026;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=3026415234>
> From: 42 <sip:42 at 192.168.20.1:5060>;tag=3026415234
> To: usuario43 <sip:43 at 192.168.20.1:5060>;tag=1176531356
> Call-ID: 66593269826955-13455355112414 at 192.168.20.13
> CSeq: 1 BYE
> Contact: <sip:43 at 192.168.20.13:5060>
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.664921 192.168.10.2:5066 -> 192.168.20.1:5060
> ACK sip:42 at 192.168.20.12:5060 SIP/2.0
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bKf6d0f6c1ee93df11
> Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>;tag=983812395
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 ACK
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:7) 1.0.1.2
> Max-Forwards: 70
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:28.665670 192.168.20.1:5060 -> 192.168.20.12:5060
> ACK sip:42 at 192.168.20.12:5060 SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bKed4e.8b482304.2
> Via: SIP/2.0/UDP 192.168.10.2:5066;branch=z9hG4bKf6d0f6c1ee93df11
> From: "unknown"<sip:unknown at 192.168.20.1>;tag=10263706333383c3
> To: <sip:42 at 192.168.20.1:5060>;tag=983812395
> Contact: <sip:9873 at 192.168.10.2:5066;user=phone>
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 21300 ACK
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:7) 1.0.1.2
> Max-Forwards: 69
> Allow: 
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK
> Content-Length: 0
> P-hint: rr-enforced
>  
>
>
>  
>
> #
> U 2008/09/19 14:30:41.078326 192.168.20.12:5060 -> 192.168.20.1:5060
> BYE sip:9873 at 192.168.10.2:5066;user=phone SIP/2.0
> Via: SIP/2.0/UDP 192.168.20.12:5060;branch=z9hG4bK1309813609243777314;rport
> Route: <sip:192.168.20.1;lr=on;ftag=10263706333383c3>
> From: <sip:42 at 192.168.20.1:5060>;tag=983812395
> To: unknown <sip:unknown at 192.168.20.1>;tag=10263706333383c3
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 1 BYE
> Max-Forwards: 70
> User-Agent: Voip Phone 1.0
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:41.078856 192.168.20.1:5060 -> 192.168.10.2:5066
> BYE sip:9873 at 192.168.10.2:5066;user=phone SIP/2.0
> Record-Route: <sip:192.168.20.1;lr=on;ftag=983812395>
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK48e9.dc5f3ea5.0
> Via: SIP/2.0/UDP 
> 192.168.20.12:5060;branch=z9hG4bK1309813609243777314;rport=5060
> From: <sip:42 at 192.168.20.1:5060>;tag=983812395
> To: unknown <sip:unknown at 192.168.20.1>;tag=10263706333383c3
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 1 BYE
> Max-Forwards: 69
> User-Agent: Voip Phone 1.0
> Content-Length: 0
> P-hint: rr-enforced
>  
>
> #
> U 2008/09/19 14:30:41.183529 192.168.10.2:5066 -> 192.168.20.1:5060
> SIP/2.0 481 No Such Call
> Via: SIP/2.0/UDP 192.168.20.1;branch=z9hG4bK48e9.dc5f3ea5.0
> Via: SIP/2.0/UDP 
> 192.168.20.12:5060;branch=z9hG4bK1309813609243777314;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=983812395>
> From: <sip:42 at 192.168.20.1:5060>;tag=983812395
> To: unknown <sip:unknown at 192.168.20.1>;tag=10263706333383c3
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 1 BYE
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:0) 1.0.1.2
> Content-Length: 0
>  
>
> #
> U 2008/09/19 14:30:41.183840 192.168.20.1:5060 -> 192.168.20.12:5060
> SIP/2.0 481 No Such Call
> Via: SIP/2.0/UDP 
> 192.168.20.12:5060;branch=z9hG4bK1309813609243777314;rport=5060
> Record-Route: <sip:192.168.20.1;lr=on;ftag=983812395>
> From: <sip:42 at 192.168.20.1:5060>;tag=983812395
> To: unknown <sip:unknown at 192.168.20.1>;tag=10263706333383c3
> Call-ID: e400cdc544f16303 at 192.168.10.2
> CSeq: 1 BYE
> User-Agent: Grandstream GXW4108 (HW 0001, Ch:0) 1.0.1.2
> Content-Length: 0
>
>
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