[Users] problem forwarding ACKs when using IPv6

[Emil Ivov]

Hello all,

We are currently performing a number of interoperability tests between 
OpenSER and SIP Communicator over IPv6.

The good news is that we have successfully established IPv6 calls 
between two SIP Communicator instances registered on our local OpenSER 
installation (version 1.1.0-7 on Debian testing).

There is however something weird we'd appreciate any ideas on what might 
be causing it:

When running OpenSER with a default configuration, any ACKs that the 
caller tries to proxy through OpenSER don't get forwarded to the callee. 
Changing syn_branch to "no" (we saw somewhere that this might be 
related) didn't have any effect. I am attaching a log snippet that seems 
to be corresponding to the ACK processing.

In a desperate attempt to resolve the issue we added the following to 
our route{} clause:

if (method == "ACK")
{
     forward("[2001:660:4701:f009:213:ceff:fea7:a88c]:5060");
     exit;
}

where [2001:660:4701:f009:213:ceff:fea7:a88c] is the IPv6 address of the 
callee.

This worked but it is obviously not (even close to) a "viable" solution.

So our question is, what would be the best way to make OpenSER forward 
ACKs that a caller is trying to send to a callee?

Thanks
Emil


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