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Markus Stamm markus at stamm.nuDear all, please disregard my fist message in this thread - I was being a fast-fingered Freddy. What I wanted to post is this: With the help of the great examples on the mailinglist, I am able to successfully make incoming and outgoing C-Net/PSTN calls via Sipgate, a German SIP provider. As my PBX is SIP-capable (it is an Auerswald Compact 5000R), I wanted to attach osmo-cc-sip-endpoint to an extension of my PBX. The registration is successful, but when I receive a call, C-Netz (or Zeitansage) registers and accepts the incoming call, but the PBX does not understand the call is connected and keeps ringing the extension. Using SNGREP, I believe I found the cause. Following a 183 Session Progress message from osmo-cc-sip-endpoint to the PBX, the PBX transmits PRACK, and osmo-cc-sip endpoint responds with a message 504 Method Not Allowed. The PBX ignores this message 504 and keeps ringing the extension until I disconnect the call. Sipgate, by contrast, responds by sending ACK, not PRACK, and the call connects successfully. I'm considering opening a ticket with Auerswald on this and would greatly appreciate your expert views. To my understanding, a 504 Method Not Allowed should prompt the PBX to fall back to ACK, or at least realise there is an issue, and yet it seems to ignore the Method Now Allowed response from osmo-cc-sip-endpoint. Does this appear correct, or might there be an issue with Sofia-SIP? I'm attaching the capture file in case this were useful. Thank you so much in advance for your insights. BR, Markus -------------- next part -------------- A non-text attachment was scrubbed... Name: auerswald.pcap Type: application/octet-stream Size: 12233 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/osmocom-analog/attachments/20210329/dfd59963/attachment.obj> -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 5718 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/osmocom-analog/attachments/20210329/dfd59963/attachment.bin>