Thanks for your reply, here is a full sip trace from the first
INVITE message to the last acknowledge which is sent to PGW.
192.168.10.189 ==> 81.21.38.34
Via: SIP/2.0/UDP
192.168.10.189:5060;branch=z9hG4bK7ddbce3f;rport
Max-Forwards: 70
CSeq: 102 INVITE
User-Agent: FPBX-2.8.1(1.8.21.0)
Date: Thu, 06 Jun 2013 09:40:42 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER,
SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Content-Type: application/sdp
Content-Length: 265
v=0
o=root 1692903116 1692903116 IN IP4 192.168.10.189
s=Asterisk PBX 1.8.21.0
c=IN IP4 192.168.10.189
t=0 0
m=audio 12584 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=ptime:20
a=sendrecv
81.21.38.34 ==> 81.21.38.5
Via: SIP/2.0/UDP
81.21.38.34;branch=z9hG4bKc526.4dbc7d09c7e34a53fab5087a11e6f210.0
Via: SIP/2.0/UDP
192.168.10.189:5060;branch=z9hG4bK7ddbce3f;rport=5060
Max-Forwards: 16
CSeq: 102 INVITE
User-Agent: FPBX-2.8.1(1.8.21.0)
Date: Thu, 06 Jun 2013 09:40:42 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER,
SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Content-Type: application/sdp
Content-Length: 277
P-hint: outbound
v=0
o=root 1692903116 1692903116 IN IP4 81.21.38.34
s=Asterisk PBX 1.8.21.0
c=IN IP4 81.21.38.34
t=0 0
m=audio 38796 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=ptime:20
a=sendrecv
a=nortpproxy:yes
81.21.38.5 ==> 81.21.38.34
Via: SIP/2.0/UDP
81.21.38.5:5060
;branch=z9hG4bKterm-1105c-22498045-94294294-67117
Via: SIP/2.0/UDP
81.21.38.34;branch=z9hG4bKc526.4dbc7d09c7e34a53fab5087a11e6f210.0
Via: SIP/2.0/UDP
192.168.10.189:5060;branch=z9hG4bK7ddbce3f;rport=5060
Max-Forwards: 15
CSeq: 102 INVITE
User-Agent: FPBX-2.8.1(1.8.21.0)
Date: Thu, 06 Jun 2013 09:40:42 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER,
SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Content-Type: application/sdp
Content-Length: 277
P-hint: outbound
v=0
o=root 1692903116 1692903116 IN IP4 81.21.38.34
s=Asterisk PBX 1.8.21.0
c=IN IP4 81.21.38.34
t=0 0
m=audio 38796 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=ptime:20
a=sendrecv
a=nortpproxy:yes
81.21.38.34==>81.21.38.55
Via: SIP/2.0/UDP
81.21.38.34;branch=z9hG4bKc526.ef179a29b1792073be0e0618cf49ac25.0
Via: SIP/2.0/UDP
81.21.38.5:5060
;branch=z9hG4bKterm-1105c-22498045-94294294-67117
Via: SIP/2.0/UDP
81.21.38.34;branch=z9hG4bKc526.4dbc7d09c7e34a53fab5087a11e6f210.0
Via: SIP/2.0/UDP
192.168.10.189:5060;branch=z9hG4bK7ddbce3f;rport=5060
Max-Forwards: 14
CSeq: 102 INVITE
User-Agent: FPBX-2.8.1(1.8.21.0)
Date: Thu, 06 Jun 2013 09:40:42 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER,
SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Content-Type: application/sdp
Content-Length: 277
P-hint: outbound
P-hint: outbound
v=0
o=root 1692903116 1692903116 IN IP4 81.21.38.34
s=Asterisk PBX 1.8.21.0
c=IN IP4 81.21.38.34
t=0 0
m=audio 38796 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=ptime:20
a=sendrecv
a=nortpproxy:yes
81.21.38.55 ==> 81.21.38.34
SIP/2.0 200 OK
CSeq: 102 INVITE
Via: SIP/2.0/UDP
81.21.38.34;branch=z9hG4bKc526.ef179a29b1792073be0e0618cf49ac25.0
Via: SIP/2.0/UDP
81.21.38.5:5060;branch=z9hG4bKterm-1105c-22498045-94294294-67117
Via: SIP/2.0/UDP
81.21.38.34;branch=z9hG4bKc526.4dbc7d09c7e34a53fab5087a11e6f210.0
Via: SIP/2.0/UDP
192.168.10.189:5060;rport=5060;branch=z9hG4bK7ddbce3f
Supported: replaces
Allow: INVITE, CANCEL, ACK, BYE, OPTIONS, INFO, REFER,
NOTIFY, UPDATE
Content-Type: application/sdp
Content-Length: 242
v=0
o=Dialogic_SIP_CCLIB 64680888 64680889 IN IP4 81.21.38.55
s=Dialogic_SIP_CCLIB
c=IN IP4 81.21.38.55
t=0 0
m=audio 49156 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=sendrecv
a=ptime:20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
81.21.38.34 ==> 81.21.38.5
SIP/2.0 200 OK
CSeq: 102 INVITE
Via: SIP/2.0/UDP
81.21.38.5:5060;branch=z9hG4bKterm-1105c-22498045-94294294-67117
Via: SIP/2.0/UDP
81.21.38.34;branch=z9hG4bKc526.4dbc7d09c7e34a53fab5087a11e6f210.0
Via: SIP/2.0/UDP
192.168.10.189:5060;rport=5060;branch=z9hG4bK7ddbce3f
Supported: replaces
Allow: INVITE, CANCEL, ACK, BYE, OPTIONS, INFO, REFER,
NOTIFY, UPDATE
Content-Type: application/sdp
Content-Length: 260
v=0
o=Dialogic_SIP_CCLIB 64680888 64680889 IN IP4 81.21.38.34
s=Dialogic_SIP_CCLIB
c=IN IP4 81.21.38.34
t=0 0
m=audio 47332 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=sendrecv
a=ptime:20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=nortpproxy:yes
81.21.38.5 ==> 81.21.38.34
SIP/2.0 200 OK
CSeq: 102 INVITE
Via: SIP/2.0/UDP
81.21.38.34;branch=z9hG4bKc526.4dbc7d09c7e34a53fab5087a11e6f210.0
Via: SIP/2.0/UDP
192.168.10.189:5060;rport=5060;branch=z9hG4bK7ddbce3f
Supported: replaces
Allow: INVITE, CANCEL, ACK, BYE, OPTIONS, INFO, REFER,
NOTIFY, UPDATE
Content-Type: application/sdp
Content-Length: 260
v=0
o=Dialogic_SIP_CCLIB 64680888 64680889 IN IP4 81.21.38.34
s=Dialogic_SIP_CCLIB
c=IN IP4 81.21.38.34
t=0 0
m=audio 47332 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=sendrecv
a=ptime:20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=nortpproxy:yes
81.21.38.34 ==> 192.168.10.189
SIP/2.0 200 OK
CSeq: 102 INVITE
Via: SIP/2.0/UDP
192.168.10.189:5060;rport=5060;branch=z9hG4bK7ddbce3f
Supported: replaces
Allow: INVITE, CANCEL, ACK, BYE, OPTIONS, INFO, REFER,
NOTIFY, UPDATE
Content-Type: application/sdp
Content-Length: 260
v=0
o=Dialogic_SIP_CCLIB 64680888 64680889 IN IP4 81.21.38.34
s=Dialogic_SIP_CCLIB
c=IN IP4 81.21.38.34
t=0 0
m=audio 47332 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=sendrecv
a=ptime:20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=nortpproxy:yes
#
Via: SIP/2.0/UDP
192.168.10.189:5060;branch=z9hG4bK76f8f103;rport*
Max-Forwards: 70*
CSeq: 102 ACK*
User-Agent: FPBX-2.8.1(1.8.21.0)*
Content-Length: 0*
Via: SIP/2.0/UDP
81.21.38.34;branch=z9hG4bKc526.9402c2edbc3ef96d9e405408364506a9.0*
Via: SIP/2.0/UDP
192.168.10.189:5060;branch=z9hG4bK76f8f103;rport=5060*
Max-Forwards: 16*
CSeq: 102 ACK*
User-Agent: FPBX-2.8.1(1.8.21.0)*
Content-Length: 0*
Regards