[osmocom-analog] PBX sends PRACK during call progress which osmo-cc-sip-endpoint rejects

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Markus Stamm markus at stamm.nu
Sun Apr 25 17:08:40 UTC 2021

Hi Andreas:

>> can you try the attached patch? Just add the line as shown in the 
>> patch. It should allow "PRACK" messages and make the stack reply to 
>> them correctly.
> Thank you for this - the signalling should now work correctly, as the 
> call connects immediately once the internal extension 221 (against which 
> osmo-cc-sip-endpoint registers) is called. There is one issue remaining 
> - once connected, no audio is transmitted. I don't believe this is 
> related to this patch, though, as my Sipgate account continues working 
> normally with the patch applied. As I am testing this in an openSUSE VM, 
> I suspect it will be more of a firewall issue - or perhaps yet another 
> Auerswald issue. I will be looking into this in more detail a little 
> later today. I'm also attaching a SNGREP capture just in case this were 
> helpful. Thank you and

It may not be a firewall issue after all - if I deactivate the openSUSE 
VM firewall completely, still no audio is transmitted. So I will try to 
explore some other possibilities, but am afraid I don't have any 
immediate leads now.

Thank you for your work and best regards,
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