R

VAPI•3mo ago

transferCall Tool Executes But Call Ends - No Transfer

Hi Vapi Support,

transferCall tool executes successfully but call ends immediately instead of transferring.

Issue:

Tool creation: Successful (201 Created)
AI triggers tool: Successful
AI speaks message: Successful
Transfer: FAILS - Call ends immediately
Destination never rings:

Tested Methods:

Number transfer: +90XXXXXXXXXX+90XXXXXXXXXX
SIP transfer: sip:XXXXXXXXXX@sip.netgsm.com.trsip:XXXXXXXXXX@sip.netgsm.com.tr

Both methods fail with same behavior.

Environment:

Agent ID: 56d1a0eb-eb0c-49f7-a762-125ff3106de156d1a0eb-eb0c-49f7-a762-125ff3106de1
Phone ID: e5fa5e02-daf3-4df5-a8f5-b854db178febe5fa5e02-daf3-4df5-a8f5-b854db178feb
Failed Call ID:
0199da09-1821-7dd9-8245-b138f0bbb386
0199da07-7986-766e-9120-c4ae2675384b
0199d9f4-e7e8-7888-acb4-ee20abcb8ab7

Provider: NetGSM (Turkey)
Language: Turkish

Expected: Call transfers to destination after AI message
Actual: Call ends immediately after AI message

Questions:

Any Turkey-specific transfer requirements?
Need forwardingPhoneNumbers in agent config?
Can you check my call logs for transfer failure reason?

Thanks!