SIP Refer / Xfer not working
# supportw
wocar01 (will)
07/26/2025, 12:21 AMWhen I try to get the AI agent to transfer the call to another SIP number, the call drops
https://cdn.discordapp.com/attachments/1398460090557792337/1398460090809319498/sip_xfer_not_working.pcap?ex=688570f3&is=68841f73&hm=3a4496644f92b69f38bba411c7573d0e9097c14bc8ada629ef6b68923c824bd9&
wocar01 (will)
07/26/2025, 12:23 AMWhen I try to get the AI agent to transfer the call to another SIP number, the call drops
h
Hilal @ UnitZero AI
07/27/2025, 5:56 AMAre you currently testing the transfer using a web call?
If yes, that’s likely the cause of the issue. Try testing it by calling from an actual phone number instead.
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wocar01 (will)
07/27/2025, 10:50 PMHello no
wocar01 (will)
07/27/2025, 10:51 PMIs there a way to pay for premium support?
wocar01 (will)
07/27/2025, 10:51 PMThanks for your answer
wocar01 (will)
07/27/2025, 10:51 PMSo the flow more or less looks like this:
wocar01 (will)
07/27/2025, 10:51 PMSIP Inbound -> AI Agent -> SIP Outbound Xfer (call dies)
wocar01 (will)
07/27/2025, 10:51 PM@Hilal @ UnitZero AI
c
Chiranjeet Mishra
07/28/2025, 8:06 AMHey, can you share the org_id? You can find it [here](https://dashboard.vapi.ai/org/settings). This will help me get more details about it.
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Hilal @ UnitZero AI
07/28/2025, 9:11 AMNo public “add-on” to pay for premium support unless you’re on an Enterprise plan.
Enterprise includes dedicated support channels, escalations, and 24/7 coverage.
Startup Program members (if eligible) get priority Slack support and perks for ~1 year.
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wocar01 (will)
07/28/2025, 3:00 PMeead07d6-ffaf-403a-93e9-40f7be1b9545
wocar01 (will)
07/29/2025, 2:38 PMHello?
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Chiranjeet Mishra
07/30/2025, 5:44 AMHey Wocar01, sorry for the late response. Can you please provide your call ID? I need it to help with the call forwarding issue.
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wocar01 (will)
07/30/2025, 5:17 PMb5d3a9fc-6f8c-43f0-832e-754476f31ccb
wocar01 (will)
07/30/2025, 5:18 PMc
Chiranjeet Mishra
08/01/2025, 4:19 PMWe are sending the SIP REFER request correctly and it seems your telephony provider is not connecting properly. You will need to check with them about it.
https://cdn.discordapp.com/attachments/1398460090557792337/1400875642060537886/image.png?ex=688e3a9c&is=688ce91c&hm=e5b9f034723375a2e5ddc5101439098738285699f0c9b396ec92a286d59753b1&
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wocar01 (will)
08/05/2025, 2:23 PMOk let me review
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