[Users] Locally generated single-hop ACKs with Route headers

Augustin, Andrew (external) Andrew.Augustin at external.t-mobile.de
Tue Jul 25 17:49:29 CEST 2006


I am using OpenSER v1.0.1

I am currently testing with proxies running OpenSER. 

I have a problem with ACK messages generated and routed for scenarios
where an inititiated call session fails to establish between A and B
parties e.g. Unsuccessful No Answer, Unsuccessful Busy. The ACK messages
are single hop locally generated responses to the sip error message e.g.
'487 Request Terminated', '486 Busy'.

The behaviour I observe is that Route headers are 'remembered' from the
initiating INVITE message and inserted into the ACK messages
automatically generated by OpenSER. 

This extra Route header causes problems with routing and the generation
unwanted messages (error message resends) in addition to expeceted
scenario call-flow. It is also visible at the B-Party. 

I would like to either prevent the creation of, or remove this Route
header. I have tried to remove this header using the OpenSER available
methods, but this has failed. 

I have noticed that the known issue described in the document: SIP
Express Router v0.8.8 - Developer's Guide under section: 9.6.4 Known
Issues appears to describe this problem. 

	"local ACK/CANCELs copy'n'pastes Route and ignores deleted

Has this issue been resolved? If so, from what version of OpenSER? 

If it has not been resolved, is there a way to resolve or workaround
this problem?

Best regards,
Andrew Augustin 
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