Outbound call generating inbound call

[devniel]

Hello LiveKit team,

We have an strange issue with a telephony provider (https://www.keyyo.com/fr/) where Outbound calls (number Keyyo -> number X) are started but then an Inbound call (SIP invite, number X -> number Keyyo) is started automatically without user intervention, and this inbound call is the one taking the user voice.

Please, do you have any idea what could happening ? I think there should be something in Keyyo side to configure but I'm not sure (we are on our way to get access to the Keyyo dashboard), we have only these options:

Otherwise, is it something that requires changing livekit/sip ?

PD: This doesn't happen with other telephony providers (Twilio, etc.)

Thank you!

[dennwc]

Sorry for the late response, but a PCAP of both calls would help solve the issue. It could be an issue in the routing headers. Or that platform doesn't act as a SIP trunk (connecting to a PSTN), but a SIP proxy (does some processing, but sends INVITE further over SIP).