Vapi Phone Numbers Not Working — PSTN Transport Issue (call.start.error-get-transport)

Leandro Weingaertner

15d • Support Needed 💻

Hey everyone, hoping someone here has run into this and can help!

I'm building a voice agent for a soccer club using Vapi + GoHighLevel (GHL). Here's the full situation:

Setup:

Connected Vapi to GHL via API key (Private Integration) — that part worked fine
- Created a GHL calendar for the test account
- Built out an agent in Vapi Composer with a full intake prompt
- Provisioned a Vapi phone number (tried two numbers, both with 949 area code for Orange County, CA)

The Problem:

The phone numbers provision successfully and show as active in Vapi, but:

Clicking on them in the Phone Numbers dashboard shows an error / blank screen
2. When trying to make an outbound test call, it fails immediately
3. Error returned: call.start.error-get-transport / EndedReason: sip:...@sip.vapi.ai

I already added a payment method to the account (a Link card is connected with a checkmark), but the issue persists.

It seems like PSTN transport is not activated on my Vapi organization, even after adding billing info.

My Org ID: 7e25cc65-0ddd-4c3b-b3d3-bce372f16137

Has anyone dealt with this before? Is this something Vapi support needs to manually activate on the backend, or is there a setting I'm missing? Any help appreciated!

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