[OpenSIPS-Users] Opensips ACK routing problem

[Nauman Sulaiman]

Hi, using Opensips 1.6.2. We are using Opensips as outbound proxy using TLS just for final hop between UAC and Opensips. Other legs of the call will be udp. We have a test set up with Sipgate (but same occurs with other providers) where an incoming INVITE to the UAC via opensips results in 200ok  generated by UAC and then the ACK coming back from sipgate server is routed over udp connection as opposed to tls, opensips seems to be ignoring the Route header in the ACK

If the contact header has a sips uri opensips will route it correctly but some voip providers do not like sips uri in contact header and we are only using tls for the final hop so are not using a sips uri for contact header.

Do we have our understanding of the spec wrong or should opensips be routing according to the route header or should it use the contact header. 

Opensips ip 172.230.135.190   UAC ip 81.13.94.206

U 217.10.79.23:5060 -> 172.230.135.190:5060
ACK sip:9082575 at 81.13.94.206:59053 SIP/2.0.
Via: SIP/2.0/UDP 217.10.79.23:5060;branch=z9hG4bK59c7.0bbb2877.2.
Via: SIP/2.0/UDP 172.20.40.4;branch=z9hG4bK59c7.0bbb2877.2.
Via: SIP/2.0/UDP 217.10.79.23:5060;received=217.10.68.226;branch=z9hG4bK6a423428.
Via: SIP/2.0/UDP 217.10.66.71:5060;branch=z9hG4bK6a423428;rport=5060.
Route: <sip:172.230.135.190;r2=on;lr=on;ftag=as126bf37e>,<sip:172.230.135.190:5061;transport=tls;r2=on;lr=on;ftag=as126bf37e>.
From: "anonymous" <sip:anonymous at sipgate.co.uk>;tag=as126bf37e.
To: <sip:00441519082575 at sipgate.co.uk>;tag=94gc3N42r9X5D.
Contact: <sip:anonymous at 217.10.66.71>.
Call-ID: 181c48541a5ad00d04322ccc0752c846 at sipgate.co.uk.
CSeq: 102 ACK.
Max-Forwards: 67.
Content-Length: 0.
X-hint: rr-enforced.
.


U 172.230.135.190:5060 -> 81.13.94.206:59053
ACK sip:9082575 at 81.13.94.206:59053 SIP/2.0.
Via: SIP/2.0/UDP 172.230.135.190;branch=z9hG4bK59c7.6f77cf2.3.
Via: SIP/2.0/UDP 217.10.79.23:5060;rport=5060;received=217.10.79.23;branch=z9hG4bK59c7.0bbb2877.2.
Via: SIP/2.0/UDP 172.20.40.4;branch=z9hG4bK59c7.0bbb2877.2.
Via: SIP/2.0/UDP 217.10.79.23:5060;received=217.10.68.226;branch=z9hG4bK6a423428.
Via: SIP/2.0/UDP 217.10.66.71:5060;branch=z9hG4bK6a423428;rport=5060.
From: "anonymous" <sip:anonymous at sipgate.co.uk>;tag=as126bf37e.
To: <sip:00441519082575 at sipgate.co.uk>;tag=94gc3N42r9X5D.
Contact: <sip:anonymous at 217.10.66.71>.
Call-ID: 181c48541a5ad00d04322ccc0752c846 at sipgate.co.uk.
CSeq: 102 ACK.
Max-Forwards: 66.
Content-Length: 0.
X-hint: rr-enforced.