[OpenSIPS-Users] URGENT: contact header changed between opensips and client

[Satish Patel]

Very interesting thing going on between opensips and my client [UA]

Opensips sending following contact header to Client but on client side i
check it received different contact header, who is changing it?

[UA]-----[Opensips]------[FS]

UA - 173.xx.xx.xx.215
Opensips - 182.xx.xx.164:5060
FS - 182.xx.xx.162:5061

My UA behind the NAT and I have ALG disabled on router.


* [Opensips] sending following packet SDP OK 200 to [UA]

2015/04/08 07:42:22.820354 182.xx.xx.164:5060 -> 173.xx.xx.215:49152
SIP/2.0 200 OK
Via: SIP/2.0/UDP 173.xx.xx.215:49152;received=173.xx.xx.215;rport=49152;
branch=z9hG4bKPjHB6245E6-SpIsEUs.kPIxxNAFMM0HTDo
Record-Route: <sip:182.xx.xx.164;lr;ftag=OdSDiepaL9YssVLqOv.
3C82QrrsrrdUV;did=3fd.556edf93>
CSeq: 722 INVITE
Contact: <sip:1646327XXXX at 182.xx.xx.162:5061;transport=udp>



* [UA] Received following packet, look at Contact:  it changed here. 162 to
164.

U 182.xx.xx.164:5060 -> 192.168.1.9:60895
IP/2.0 200 OK.
Via: SIP/2.0/UDP 173.xx.xx.215:49152;received=192.168.1.9;rport=49152;
branch=z9hG4bKPjHB6245E6-SpIsEUs.kPIxxNAFMM0HTDo.
Record-Route: <sip:182.xx.xx.164:5060;lr;ftag=OdSDiepaL9YssVLqOv.
3C82QrrsrrdUV;did=3fd.556edf93>.
CSeq: 722 INVITE.
Contact: <sip:1646327XXXX at 182.xx.xx.164:5061;transport=udp>.
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