[Serusers] loose_route bug?!

[Ramin Nikaeen]

Hi Everyone,

 

I am using SER version 

Server: Sip EXpress router (0.9.2 (i386/linux)).

 

I am initiating a call from a caller sip UA to a callee sip UA and I am
receiving the 

ACK response to the INVITE from the callee on SER. Before loose_route
processing 

it looks like this:

 

 

ACK sip:2224440133 at 10.1.10.65:5060 SIP/2.0

Via: SIP/2.0/UDP
172.16.15.52:5060;rport;branch=z9hG4bK83e54f590401584628d473053d1ef8a8

From: <sip:2224440132 at xxx.yyy.zzz:5060>;tag=1cac2190

To: <sip:2224440131 at xxx.yyy.zzz:5060>;tag=d323038ba423a329i0

Call-ID: 66cb6ba85191e6025ebde2c552177442 at 172.16.15.52

CSeq: 1 ACK


Contact: <sip:2224440132 at 172.16.15.52:5060>

Max-Forwards: 70


Route:
<sip:10.1.10.65;ftag=1cac2190;lr>,<sip:10.1.10.65;ftag=1cac2190;lr>

Content-Length: 0


 


 


After loose_route processing and relaying, the ACK, instead of being
routed to the callee

(2224440133) User Agent, it is received back at SER looking like this:

 

 

ACK sip:10.1.10.65;ftag=1cac2190;lr SIP/2.0

Record-Route: <sip:10.1.10.65;ftag=1cac2190;lr=on>

Via: SIP/2.0/UDP 10.1.10.65;branch=0

Via: SIP/2.0/UDP
172.16.15.52:5060;rport=5060;branch=z9hG4bK83e54f590401584628d473053d1ef
8a8

From: <sip:2224440132 at xxx.yyy.zzz:5060>;tag=1cac2190

To: <sip:2224440131 at xxx.yyy.zzz:5060>;tag=d323038ba423a329i0

Call-ID: 66cb6ba85191e6025ebde2c552177442 at 172.16.15.52

CSeq: 1 ACK

Contact: <sip:2224440132 at 172.16.15.52:5060>

Max-Forwards: 16

Route:

Content-Length: 0

 

Why is SER routing this ACK request incorrectly?! 

 

Is the syntax of the original ACK generated by the Callee's UA
incorrect?!

 

I would appreciate any help as I can't figure it whether there is
something wrong

with ACK's syntax or there is a bug in SER's loose_route processing?!

 

Thanks a lot

 

ramin

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