[SR-Users] Kamailio behind NAT, ACK to private IP not advertised public IP.

Thu Dec 29 03:08:38 CET 2016

I am attaching latest config along with kamailio log file and client trace.
Please let me know how I can get Kamailio to advertise public ip in record route.

I followed all the steps mentioned here - http://www.fredposner.com/1457/kamailio-behind-nat/

Thanks
Pranathi

From: Pranathi Venkatayogi
Sent: Wednesday, December 28, 2016 5:09 PM
To: 'sr-users at lists.sip-router.org' <sr-users at lists.sip-router.org>
Cc: Mick McGrellis <MMcGrellis at cyracom.com>; 'miconda at gmail.com' <miconda at gmail.com>
Subject: RE: Kamailio behind NAT, ACK to private IP not advertised public IP.

I implemented full NAT logic as per the sample config. Still unable to resolve the issue.
How do I let Kamailio change record_route header to use public ip address?

Please help!!!

(attached are latest scripts)

From: Pranathi Venkatayogi
Sent: Wednesday, December 28, 2016 12:39 PM
To: 'sr-users at lists.sip-router.org' <sr-users at lists.sip-router.org<mailto:sr-users at lists.sip-router.org>>
Subject: Kamailio behind NAT, ACK to private IP not advertised public IP.

Hi,
  I am encountering the same problem described in google groups<https://groups.google.com/forum/#!topic/2600hz-dev/-xvUZUrv4Y4>. However I dint not find any resolution hence writing again.

  200 OK sent from the server has private Ip in its record route. As you see below, though the message is received on public IP (63.149.103.72) , the record route is set to private IP (172.31.211.31)
  I used listen with advertise of public IP, it did not work. Please find attached the config I am using.

  How do I change it send public ip only when talking to external world.
  Can someone point to me clear documentation how to configure Kamailio for NAT traversal.

The following message is sent from Kamailio behind NAT to the public computer.
2016-12-27 17:19:24.526875 [blink.exe 5652]: RECEIVED: Packet 123, +0:08:42.690309
63.149.103.72:5061 -(SIP over TLS)-> 10.0.0.6:62912
SIP/2.0 200 OK
Via: SIP/2.0/TLS 10.0.0.6:62912;rport=62912;received=50.175.10.190;branch=z9hG4bKPj2e381a96979945bd969989ffe9dca3a9;alias
Record-Route: <sip:172.31.211.31:5061;transport=tls;lr;did=5.5e5>
Call-ID: eb8670eec4354acdb69fd26f5625b75c
From: "cust1" <sip:cust1 at translation.sms-test.cyracom.com>;tag=2f25d2ae690747c48c874e0b415ca03c
To: <sip:spanish at translation.sms-test.cyracom.com>;tag=1c33ad41f6f44cae8ae8e060f30fe119
CSeq: 4665 INVITE
Server: Blink 3.0.0 (Windows)
Allow: SUBSCRIBE, NOTIFY, PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, MESSAGE, REFER
Contact: <sip:75329410 at 10.0.27.108:61381;transport=tls>
Supported: 100rel, replaces, norefersub, gruu
Content-Type: application/sdp
Content-Length:   355
v=0
o=- 3691844303 3691844304 IN IP4 10.0.27.108
s=Blink 3.0.0 (Windows)
t=0 0
m=message 2855 TCP/TLS/MSRP *
c=IN IP4 10.0.27.108
a=path:msrps://10.0.27.108:2855/261d3f47be25612cc77c;tcp
a=accept-types:message/cpim text/* image/* application/im-iscomposing+xml
a=accept-wrapped-types:text/* image/* application/im-iscomposing+xml
a=setup:active
--

The following is the ACK sent by public computer in reply to the above message. Note this message never reaches the Kamailio server as it is sent to private IP.
2016-12-27 17:19:24.526875 [blink.exe 5652]: SENDING: Packet 124, +0:08:42.690309
10.0.0.6:62944 -(SIP over TLS)-> 172.31.211.31:5061
ACK sip:75329410 at 10.0.27.108:61381;transport=tls SIP/2.0
Via: SIP/2.0/TLS 10.0.0.6:62944;rport;branch=z9hG4bKPj7df757862e6546beba18a646cb965ba2;alias
Max-Forwards: 70
From: "cust1" <sip:cust1 at translation.sms-test.cyracom.com>;tag=2f25d2ae690747c48c874e0b415ca03c
To: <sip:spanish at translation.sms-test.cyracom.com>;tag=1c33ad41f6f44cae8ae8e060f30fe119
Call-ID: eb8670eec4354acdb69fd26f5625b75c
CSeq: 4665 ACK
Route: <sip:172.31.211.31:5061;transport=tls;lr;did=5.5e5>
User-Agent: Blink 3.0.0 (Windows)
Content-Length:  0

Thanks,
Pranathi Venkatayogi
System Developer II
(520) 745-9447 x4466
www.cyracom.com<http://www.cyracom.com/>

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