[Users] Call dropped after 6 ACKs. Branch=0 problem?

kjcsb kjcsb at orcon.net.nz
Mon Apr 2 05:21:29 CEST 2007 

I have the following scenario:
PSTN gateway (202.180.nnn.nnn) -> OpenSER 1.0.1 (147.202.nnn.nnn) -> 
Asterisk 1.2.16
(203.89.nnn.nnn)

When an incoming call is received, the call is established but often (but 
not always) eventually dropped. In the following dialogue, it can be seen 
that when the ACK is passed from the gateway on to Asterisk, OpenSER appends 
a Via with branch=0. After a number of these ACKs are passed on, the call is 
eventually dropped. It has been suggested by someone on the Asterisk list 
that "While "branch=0" is valid in RFC 2543, I don't think an INVITE can 
start-off as RFC 3261 and then the ACK can switch over to RFC 2543 in the 
middle of the transaction." i.e. the implication is that it's an OpenSER 
problem.

Does that seem right? If so how can it be corrected? If not, could anyone 
advise what the problem might be or suggest any resolutions?

U 202.180.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
INVITE sip:6499777777 at domain.co.nz SIP/2.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Max-Forwards: 70
Date: Mon, 02 Apr 2007 02:53:24 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Content-Type: application/sdp
Content-Length: 336

v=0
o=root 8802 8802 IN IP4 202.180.nnn.nnn
s=session
c=IN IP4 202.180.nnn.nnn
t=0 0
m=audio 35268 RTP/AVP 18 97 3 0 8 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:97 iLBC/8000
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 147.202.nnn.nnn:5060 -> 202.180.nnn.nnn:5060
SIP/2.0 100 trying -- your call is important to us
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
Server: OpenSer (1.0.1 (i386/linux))
Content-Length: 0
Warning: 392 147.202.nnn.nnn:5060 "Noisy feedback tells:  pid=29716 
req_src_ip=202.180.nnn.nnn req_src_port=5060 
in_uri=sip:6499777777 at domain.co.nz out_uri=sip:6499777777 at 203.89.nnn.nnn 
via_cnt==1"



U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
INVITE sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Max-Forwards: 69
Date: Mon, 02 Apr 2007 02:53:24 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Content-Type: application/sdp
Content-Length: 336

v=0
o=root 8802 8802 IN IP4 202.180.nnn.nnn
s=session
c=IN IP4 202.180.nnn.nnn
t=0 0
m=audio 35268 RTP/AVP 18 97 3 0 8 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:97 iLBC/8000
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
INVITE sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Max-Forwards: 69
Date: Mon, 02 Apr 2007 02:53:24 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Content-Type: application/sdp
Content-Length: 336

v=0
o=root 8802 8802 IN IP4 202.180.nnn.nnn
s=session
c=IN IP4 202.180.nnn.nnn
t=0 0
m=audio 35268 RTP/AVP 18 97 3 0 8 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:97 iLBC/8000
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 203.89.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 
147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0;received=147.202.nnn.nnn
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Length: 0



U 203.89.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 
147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0;received=147.202.nnn.nnn
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 147.202.nnn.nnn:5060 -> 202.180.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 203.89.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 
147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0;received=147.202.nnn.nnn
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16301 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 147.202.nnn.nnn:5060 -> 202.180.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16301 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 202.180.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK013cd54d;rport
Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 70
Content-Length: 0



U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK013cd54d;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 69
Content-Length: 0



U 202.180.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK54b95a19;rport
Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 70
Content-Length: 0



U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK54b95a19;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 69
Content-Length: 0



U 203.89.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 
147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0;received=147.202.nnn.nnn
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 147.202.nnn.nnn:5060 -> 202.180.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 202.180.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK46a352b9;rport
Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 70
Content-Length: 0



U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK46a352b9;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 69
Content-Length: 0



U 203.89.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 
147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0;received=147.202.nnn.nnn
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 147.202.nnn.nnn:5060 -> 202.180.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 202.180.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK2da46c51;rport
Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 70
Content-Length: 0



U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK2da46c51;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 69
Content-Length: 0



U 203.89.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 
147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0;received=147.202.nnn.nnn
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 147.202.nnn.nnn:5060 -> 202.180.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 202.180.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK23a5accc;rport
Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 70
Content-Length: 0



U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK23a5accc;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 69
Content-Length: 0



U 203.89.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 
147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0;received=147.202.nnn.nnn
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 147.202.nnn.nnn:5060 -> 202.180.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 202.180.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK153c7273;rport
Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 70
Content-Length: 0



U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK153c7273;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 69
Content-Length: 0



U 203.89.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 
147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0;received=147.202.nnn.nnn
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 147.202.nnn.nnn:5060 -> 202.180.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 202.180.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK01e676a5;rport
Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 70
Content-Length: 0



U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK01e676a5;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 69
Content-Length: 0



U 203.89.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 
147.202.nnn.nnn;branch=z9hG4bKd5ab.736d6085.0;received=147.202.nnn.nnn
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 147.202.nnn.nnn:5060 -> 202.180.nnn.nnn:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0b505d2b;rport=5060
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:6499777777 at 203.89.nnn.nnn>
Content-Type: application/sdp
Content-Length: 244

v=0
o=root 16300 16300 IN IP4 203.89.nnn.nnn
s=session
c=IN IP4 203.89.nnn.nnn
t=0 0
m=audio 19952 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -


U 202.180.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0a0ddae8;rport
Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 70
Content-Length: 0



U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
ACK sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK0a0ddae8;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 102 ACK
User-Agent: Asterisk PBX
Max-Forwards: 69
Content-Length: 0



U 202.180.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
BYE sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK12646817;rport
Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 103 BYE
User-Agent: Asterisk PBX
Max-Forwards: 70
Content-Length: 0



U 147.202.nnn.nnn:5060 -> 203.89.nnn.nnn:5060
BYE sip:6499777777 at 203.89.nnn.nnn SIP/2.0
Record-Route: <sip:147.202.nnn.nnn;ftag=as3f0f7d93;lr=on>
Via: SIP/2.0/UDP 147.202.nnn.nnn;branch=z9hG4bKe5ab.311dd295.0
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK12646817;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Contact: <sip:6494444444 at 202.180.nnn.nnn>
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 103 BYE
User-Agent: Asterisk PBX
Max-Forwards: 69
Content-Length: 0



U 203.89.nnn.nnn:5060 -> 147.202.nnn.nnn:5060
SIP/2.0 481 Call leg/transaction does not exist
Via: SIP/2.0/UDP 
147.202.nnn.nnn;branch=z9hG4bKe5ab.311dd295.0;received=147.202.nnn.nnn
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK12646817;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 103 BYE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Content-Length: 0



U 147.202.nnn.nnn:5060 -> 202.180.nnn.nnn:5060
SIP/2.0 481 Call leg/transaction does not exist
Via: SIP/2.0/UDP 202.180.nnn.nnn:5060;branch=z9hG4bK12646817;rport=5060
From: "6494444444" <sip:6494444444 at 202.180.nnn.nnn>;tag=as3f0f7d93
To: <sip:6499777777 at domain.co.nz>;tag=as060f43a9
Call-ID: 2f573abd3cd80bd369495e322ec5ab4a at 202.180.nnn.nnn
CSeq: 103 BYE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Content-Length: 0



Thanks

Cameron

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