B2BUA: ACK for RE-INVITE contains wrong branch

Lambert98 · Post by **Lambert98** » Fri Aug 07, 2009 3:22 am

1. Brekeke Product Name and version:
SIP Server 2.37.4
2. Java version:

3. OS type and the version:

4. UA (phone), gateway or other hardware/software involved:

5. Select your network pattern from http://www.brekeke-sip.com/bbs/network/ ... terns.html :

6. Your problem:
The ACK for a RE_INVITE contains same branch as the RE_INVITE
-> same transaction : ACK is ignored and OK is send until timeout

Traces:
initial INVITE:

ZGvE5}L3INVITE sip:5006@172.24.5.159;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 172.24.5.160:5060;branch=z9hG4bK-d8754z-15149f755fde85e7-1---d8754z-

!ZGE+as*INVITE sip:5006@172.24.5.154:5070 SIP/2.0
Via: SIP/2.0/UDP 172.24.5.159:5060;rport;branch=z9hG4bKa8993331addb381431c22-64254860-e2c0d829

ZG!E@SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.24.5.159:5060;rport=5060;branch=z9hG4bKa8993331addb381431c22-64254860-e2c0d829;received=172.24.5.159

vZGE+SS5SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.24.5.160:5060;branch=z9hG4bK-d8754z-15149f755fde85e7-1---d8754z-

ZGvE@eTIACK sip:5006@172.24.5.159:5060 SIP/2.0
Via: SIP/2.0/UDP 172.24.5.160:5060;branch=z9hG4bK-d8754z-4618044a1c18d3d3-1---d8754z-

!ZGE,%ACK sip:5006@172.24.5.154:5070 SIP/2.0
Via: SIP/2.0/UDP 172.24.5.159:5060;rport;branch=z9hG4bK94fca43df022561431c22-64254860-a14c453d

Re-INVITE

ZGvEAwC+INVITE sip:5006@172.24.5.159:5060 SIP/2.0
Via: SIP/2.0/UDP 172.24.5.160:5060;branch=z9hG4bK-d8754z-e869f48e9f027bc4-1---d8754z-

!ZGE*'INVITE sip:5006@172.24.5.154:5070 SIP/2.0
Via: SIP/2.0/UDP 172.24.5.159:5060;rport;branch=z9hG4bKcbe79e218904f51431c22-64254860-15c73934

ZG!E0@USIP/2.0 200 OK
Via: SIP/2.0/UDP 172.24.5.159:5060;rport=5060;branch=z9hG4bKcbe79e218904f51431c22-64254860-15c73934;received=172.24.5.159

vZGE*JSIP/2.0 200 OK
Via: SIP/2.0/UDP 172.24.5.160:5060;branch=z9hG4bK-d8754z-e869f48e9f027bc4-1---d8754z-

ZGvE[JACK sip:5006@172.24.5.159:5060 SIP/2.0
Via: SIP/2.0/UDP 172.24.5.160:5060;branch=z9hG4bK-d8754z-4ae409aee10d745c-1---d8754z-

!ZGE+xACK sip:5006@172.24.5.154:5070 SIP/2.0
Via: SIP/2.0/UDP 172.24.5.159:5060;rport;branch=z9hG4bKcbe79e218904f51431c22-64254860-15c73934

tuie2 · Post by **tuie2** » Tue Aug 11, 2009 4:13 pm

Who sent such an ACK packet?

Can you post these packets in http://pcapr.net/?

Lambert98 · Post by **Lambert98** » Wed Aug 12, 2009 11:19 am

trace uploaded:
http://www.pcapr.net/view/mario.schroet ... .pcap.html

tuie2 · Post by **tuie2** » Mon Aug 17, 2009 10:35 am

Lambert98,
I will look at it.

tuie2 · Post by **tuie2** » Wed Aug 19, 2009 4:50 pm

Does the same issue happen even if you don't use B2B UA mode at Brekeke SIP Server?

Lambert98 · Post by **Lambert98** » Thu Aug 20, 2009 4:45 am

No -- in 'normal' mode it works well. The ACK's are correct. Everything is working as expected

tuie2 · Post by **tuie2** » Thu Aug 20, 2009 11:42 pm

I checked it with a Brekeke　developer.
He said it is a bug in the B2B-UA mode.

It will be fixed in a future version.