[Users] problem forwarding ACKs when using IPv6

Klaus Darilion klaus.mailinglists at pernau.at
Mon Jan 8 13:50:49 CET 2007

Hi Emil!

Are you sure that the ACK is correct formated? Maybe you can attach a 
"ngrep -W byline port 5060" dump and your config.


Emil Ivov wrote:
> 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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Klaus Darilion

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