We are also having issues with SIP. We are connecting via our Asterisk server, and right now we are experiencing “No session found for provided call_id”. The webhooks never arriving also an on-and-off issue for us.

Hey @yurashark sorry I didn’t respond sooner. Are you still seeing issues? I just deployed lots of changes described here Realtime API unreliable over SIP - #13 by Sean-Der hopefully that helped. If not I would love to help debug.

Do you mind if I merge here? Thanks! [image] Twilio - OpenAI SIP Trunk calls failing with '400 Bad Request' error Bugs Sorry about this. I am working on this right now. The Webhook service isn’t sending HTTP Requests fast enough (because of the amount of traf…

D’oh. It is a separate issue, so I’ll defer to @vb here who is likely more informed on the situation. Sorry about that! Just trying to make sure it gets eyes on it. :slight_smile: Glad you’re here with us. Hope your year is going well otherwise!

Thank you sir for a kind reply. Hope yours is good as well!

Troubleshooting SIP and Asterisk communication issues

API Bugs

yurashark January 15, 2026, 12:41am 3

my message was actually split from a different topic, with a similar topic

from this one - Realtime API unreliable over SIP - #9 by Sean-Der

Topic		Replies	Views
Realtime API unreliable over SIP API realtime , sip	12	816	January 17, 2026
SIP calls fail for a few minutes every day Bugs gpt-realtime	2	91	January 17, 2026
Invalid SDP offer in starting SIP call Bugs realtime , api-realtime	35	711	January 14, 2026
SIP: Caller hangup closes session WebSocket immediately, preventing event draining + early-hangup calls still accepted API realtime , api-realtime , sip	6	185	March 2, 2026
Consistently 3–5s (sometimes 7s) INVITE→realtime.call.incoming delay on SIP Realtime; accept is <1s. Any guidance? API api-realtime	4	163	January 20, 2026

Troubleshooting SIP and Asterisk communication issues

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