Hello, haven't touched my voice agent for a long time. Been working in production using SIP REFER cold transfer back through Telnyx which I have then going to VitalPBX trunk in Telnyx. Getting busy on the inbound leg from Retell AI to my vitalpbx trunk. I can't find anything wrong with vitalpbx we have endpoints active registered per asterisk waiting for calls but 486. Looks like SIP REFER is now using same as inbound? INVITE sip:7209533316@5t4n6j0wnrl.sip.livekit.cloud instead of how it was 3 days ago was sending same invite here INVITE sip:17209533316@44.253.49.240:5061 I haven't had issues with Retell so very hesitant posting here but been looking at it for over 3 hours now and just seems like all of a sudden SIP REFER cold transfer started behaving differently or there was a breaking change implemented (seems unlikely). https://cdn.discordapp.com/attachments/1464386925665194047/1464386925837422592/goodinboundcall3daysago.txt?ex=6975481a&is=6973f69a&hm=d84fb33db94ac58799bb4bdfa6c4799a03b16158aabb1c0a36f1acf561add120& https://cdn.discordapp.com/attachments/1464386925665194047/1464386926424358962/newbadsipinvite.txt?ex=6975481a&is=6973f69a&hm=ea49dea83a4a7f26ff03aa00b40e3bc65d7de6ddfffe119ba3267f89a9d21055& https://cdn.discordapp.com/attachments/1464386925665194047/1464386926856376390/newbadcall.pcap?ex=6975481a&is=6973f69a&hm=d46bea12c6edfca10d4fb4710abff3ee806ce5a84d96da964c009d00161e1627& https://cdn.discordapp.com/attachments/1464386925665194047/1464386927678722242/older_successful_call_log.pcap?ex=6975481a&is=6973f69a&hm=b427984befaf62add8a30434661c52849236e24289857c3deda06079a7228bd2&

sip invite only works with numbers bought through the dashboard -- hope this helps

Colin, we have had this in production running around $250 a month in cost fyi - 4 physical locations all inbound phone calls run through it since last August. Retell AI (as proven in the logs I provided) started sending different SIP INVITE back through the same agent. I'd like support to confirm that I made no changes to my agent. All I did was republish the same agent and it started sending the expected/original/typical sip invite back through the sip trunk e.g. telnyx. I would expect such as clearly a bug that made it lose it setting despite not having a setting changed.

Look at my issue, probably helps, i found somethink: https://discord.com/channels/1186424376300679209/1465729054643716230/1465729054643716230

there was a recent deprecation , please check this https://docs.retellai.com/deprecation-notice/1-26-2026