[SR-Users] Question on ACK behavior

[Varsha Venkatraramani]

** **

*
*

** **

Hi,

** **

I have a question regarding the below ACK response Kamilaio receives from a
carrier. Can  someone please help me understand why the “*Route:
sip:callmanager at 192.168.160.43:5060> *sent from Kamailio is missing a “<”
as shown in the captures below? Our Internal proxy is treating that as a
malformed header and dropping the packet.

** **

** **

*ACK from CARRIER*

* *

U 2012/08/01 18:32:52.219852 4.55.18.227:5060 -> 192.168.160.47:5060****

*ACK sip:callmanager at 192.168.160.43:5060 SIP/2.0.*

Via: SIP/2.0/UDP 4.55.18.227:5060;branch=z9hG4bK04B0eef33040e9b8e70.****

From: sip:+14088442721 at 4.55.18.227:5060;tag=gK043001e3.****

To: sip:+19728931740 at 192.168.160.47:5060;tag=b307370c678f3b44.****

Call-ID: 295226_50030734 at 4.55.18.227.****

CSeq: 18079 ACK.****

Max-Forwards: 70.****

Route: <sip:192.168.160.47:5060;lr=on>.****

*Route: <sip:2c6c6d1ab58c623912f6b8a6ee526982 at 192.168.160.44:5060>.*

Content-Length: 0.****

.****

*ACK FORWARDED TO SIP PROXY*

** **

U 2012/08/01 18:32:52.220612 192.168.160.47:5060 -> 192.168.160.44:5060****

*ACK sip:2c6c6d1ab58c623912f6b8a6ee526982 at 192.168.160.44:5060 SIP/2.0.*

Via: SIP/2.0/UDP 192.168.160.47;branch=z9hG4bKcydzigwkX.****

Via: SIP/2.0/UDP 4.55.18.227:5060;branch=z9hG4bK04B0eef33040e9b8e70.****

From: sip:+14088442721 at 4.55.18.227:5060;tag=gK043001e3.****

To: sip:+19728931740 at 192.168.160.47:5060;tag=b307370c678f3b44.****

Call-ID: 295226_50030734 at 4.55.18.227.****

CSeq: 18079 ACK.****

Max-Forwards: 69.****

Content-Length: 0.****

*Route: sip:callmanager at 192.168.160.43:5060>.*

I have attached the config file for you reference. Kamailio version is 3.2.3
****

** **

Thank You****

Varsha****
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.sip-router.org/pipermail/sr-users/attachments/20120802/23bbf171/attachment.htm>