livekit.api.twirp_client.TwirpError: TwirpError(code=internal, message=twirp error unknown: sip status 500: INTERNAL_SERVER_ERROR, status=500, metadata={'error_details': 'CA0SJXNpcCBzdGF0dXMgNTAwOiBJTlRFUk5BTF9TRVJWRVJfRVJST1IaLAoldHlwZS5nb29nbGVhcGlzLmNvbS9saXZla2l0LlNJUFN0YXR1cxIDCPQD', 'sip_status': 'SIP_STATUS_INTERNAL_SERVER_ERROR', 'sip_status_code': '500'}) facing error when transfering agents

What does your LiveKit dashboard calls say. Also what does the SIP providers logs show?

@refined-appointment-81829 Thanks for asking I can't find any logs regarding SIP call transfer in livekit dashboard. also no logs in SIP provider also

you don't see them under telephony? How about a PCAP from your SIP provider side

@refined-appointment-81829 This is my PCAP from SIP provider

I think you attached the wrong file. That looks like a screen shot

This is the PCAP file, I can't find log regarding call forwarding request

cool. Packet 9 shows the callee did not accept your call. I think you need find ask whatever system received that call to find out why