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docs(sip): state that Vapi SIP numbers are inbound only #1197

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Merged
stephenvapiai merged 3 commits into from
Sep 8, 2026
Merged

docs(sip): state that Vapi SIP numbers are inbound only #1197

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docs(sip): state that Vapi SIP numbers are inbound only
chiranjeet-vapi Sep 6, 2026
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style: clarify inbound-only SIP numbers
stephenvapiai Sep 8, 2026
8558d1f
Merge branch 'main' into docs/free-vapi-sip-inbound-only
stephenvapiai Sep 8, 2026
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6 changes: 6 additions & 0 deletions fern/advanced/sip/sip.mdx
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Expand Up @@ -8,6 +8,12 @@ slug: advanced/sip

This guide shows you how to set up and test SIP calls to your Vapi assistant using any SIP client or softphone. You'll create an assistant, assign it a SIP phone number, and make a call using a SIP URI. You can also pass template variables via SIP headers.

<Warning>
A Vapi SIP phone number supports **inbound calls only** because it has a `sipUri` but no public switched telephone network (PSTN) phone number for outbound calls. Outbound attempts fail with `call.start.error-get-transport` and the message `Vapi Numbers Can't Dial Outbound Yet.`

To place outbound calls, [import a phone number from a supported provider](/phone-numbers/import-twilio) or [connect your own SIP trunk](/advanced/sip/sip-trunk). Use a SIP trunk for international destinations.
</Warning>

## Choose your Vapi region

Use the API base URL, private key, and SIP host from the same Vapi region. Do not create a SIP phone number in one region with a SIP URI from another region.
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