[OpenSIPS-Users] PROXY behind a NAT

[Ignacio Gonzalez]

Hello everybody, I installed and configured opensips with a residential
configuration setting NAT Traversal and Multidomain options with the
opensips configuration tool. When I try to make a call with two users, the
ACK method of the caller party never reaches the called party.

This are the messages received in the called party:


INVITE sip:ralvarez at domain;transport=udp SIP/2.0
Via: SIP/2.0/UDP 10.151.199.52:45084
;branch=z9hG4bK-d8754z-06f2fafe119979f6-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:2427001 at 201.255.1.30:45084;transport=udp>
To: <sip:ralvarez at domain>
From: <sip:2427001 at domain>;tag=2627e587
Call-ID: ZTg3YjI0ZGNiYjVjZjZlMDRlNjU1Mzg1ZGJkMWQ0NmQ.
CSeq: 2 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE,
SUBSCRIBE, INFO
Content-Type: application/sdp
Proxy-Authorization: Digest
username="2427001",realm=:"domain",nonce="4ffbbd42000000478de4c68512245fee27f7dadd4549c048",uri="sip:ralvarez at domain
;transport=udp",response="8fe20af4d2a381cc6a4ebd3ac1162f69",algorithm=MD5
Supported: replaces
User-Agent: X-Lite 4 release 4.1 stamp 63214
Content-Length: 410

v=0
o=- 12986371568156250 1 IN IP4 10.151.199.52
s=CounterPath X-Lite 4.1
c=IN IP4 10.151.166.52
t=0 0
a=ice-ufrag:6079ef
a=ice-pwd:8febe129544f5ec86474270bef1a9214
m=audio 53146 RTP/AVP 107 0 8 101
a=rtpmap:107 BV32/16000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
a=candidate:1 1 UDP 659136 10.151.199.52 53146 typ host
a=candidate:1 2 UDP 659134 10.151.199.52 53147 typ host

SIP/2.0 100 Giving a try
Via: SIP/2.0/UDP 10.151.199.52:45084
;received=201.255.1.30;branch=z9hG4bK-d8754z-06f2fafe119979f6-1---d8754z-;rport=45084
To: <sip:ralvarez at domain>
From: <sip:2427001 at domain>;tag=2627e587
Call-ID: ZTg3YjI0ZGNiYjVjZjZlMDRlNjU1Mzg1ZGJkMWQ0NmQ.
CSeq: 2 INVITE
Server: OpenSIPS (1.8.0-notls (i386/linux))
Content-Length: 0

SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 10.151.199.52:45084
;received=201.255.1.30;branch=z9hG4bK-d8754z-06f2fafe119979f6-1---d8754z-;rport=45084
Record-Route: <sip:192.100.1.220;lr;did=af5.ad45d1c6;nat=yes>
*Contact: <sip:ralvarez at 192.100.1.1:30612;rinstance=e0b11e2eb514ba1c>*
To: <sip:ralvarez at domain>;tag=e637fa0f
From: <sip:2427001 at domain>;tag=2627e587
Call-ID: ZTg3YjI0ZGNiYjVjZjZlMDRlNjU1Mzg1ZGJkMWQ0NmQ.
CSeq: 2 INVITE
User-Agent: X-Lite release 1002tx stamp 29712
Content-Length: 0

SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.151.199.52:45084
;received=201.255.1.30;branch=z9hG4bK-d8754z-06f2fafe119979f6-1---d8754z-;rport=45084
Record-Route: <sip:192.100.1.220;lr;did=af5.ad45d1c6;nat=yes>
*Contact: <sip:ralvarez at 192.100.1.1:30612;rinstance=e0b11e2eb514ba1c>*
To: <sip:ralvarez at domain>;tag=e637fa0f
From: <sip:2427001 at domain>;tag=2627e587
Call-ID: ZTg3YjI0ZGNiYjVjZjZlMDRlNjU1Mzg1ZGJkMWQ0NmQ.
CSeq: 2 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE,
SUBSCRIBE, INFO
Content-Type: application/sdp

.... More OK responses ( retries )

BYE sip:2427001 at 201.255.1.30:45084;transport=udp SIP/2.0
Via: SIP/2.0/UDP 192.100.1.220;branch=z9hG4bKe265.bd09554.0
Via: SIP/2.0/UDP 192.100.1.200:30612
;received=192.168.1.200;branch=z9hG4bK-d87543-4677b2285a79346c-1--d87543-;rport=30612
Max-Forwards: 69
Contact: <sip:ralvarez at 192.100.1.200:30612;rinstance=e0b11e2eb514ba1c>
To: <sip:2427001 at domain>;tag=2627e587
From: <sip:ralvarez at domain>;tag=e637fa0f
Call-ID: ZTg3YjI0ZGNiYjVjZjZlMDRlNjU1Mzg1ZGJkMWQ0NmQ.
CSeq: 2 BYE
User-Agent: X-Lite release 1002tx stamp 29712
Reason: SIP;description="ACK not received"
Content-Length: 0

SIP/2.0 200 OK
Via: SIP/2.0/UDP
192.100.1.220;branch=z9hG4bKe265.bd09554.0;received=24.94.9.135
Via: SIP/2.0/UDP 192.100.1.200:30612
;received=192.100.1.200;branch=z9hG4bK-d87543-4677b2285a79346c-1--d87543-;rport=30612
Contact: <sip:2427001 at 201.255.1.30:45084;transport=udp>
To: <sip:2427001 at domain>;tag=2627e587
From: <sip:ralvarez at domain>;tag=e637fa0f
Call-ID: ZTg3YjI0ZGNiYjVjZjZlMDRlNjU1Mzg1ZGJkMWQ0NmQ.
CSeq: 2 BYE
User-Agent: X-Lite 4 release 4.1 stamp 63214
Content-Length: 0

-----------------------------------------------
I need to fix the contact header value because the IP address is behind the
NAT and is not reachable from the caller party location. I don't know how
to do this, reading some answers in the users mail list i found that
setting the global parameter "advertised_address" in the configuration file
it will solved it but I'm not sure, can anybody tell me if this is correct?

Thanks for all.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opensips.org/pipermail/users/attachments/20120710/e0c99703/attachment-0001.htm>