Hi, I am trying to build a demo for a client and every time I try to make an outbound call I get An error occurred in this call: call.in-progress.error-providerfault-outbound-sip-403-forbidden I need urgent help since we have demo after 2 days with a client *I followed everything in the guide * Call Id: 019ab5b4-354d-7006-8135-41b440b5c65b Error: An error occurred in this call: call.in-progress.error-providerfault-outbound-sip-403-forbidden I am trying Outbound only for now I've Just purchased a new Twilio account and linked it to Vapi

Action Required: Make sure you have whitelisted Vapi's SIP server IPs in your Twilio Elastic SIP Trunk settings. In Twilio, add these IPs to your trunk's allowed list:

44.229.228.186
44.238.177.138

This step is crucial for outbound calls to work—missing it often causes the 403 Forbidden error. For more details, see the [Twilio SIP integration guide](https://docs.vapi.ai/advanced/sip/twilio). Source: - [Twilio SIP Integration](https://docs.vapi.ai/advanced/sip/twilio)

they are whitelisted

The sip-403-forbidden error in an outbound call, especially when linking a new Twilio account to Vapi, is almost always an authorization failure related to Twilio's security settings or credentials. The best and most efficient solution is to first verify the Twilio Account SID and Auth Token within your Vapi integration settings, ensuring they are entered perfectly, as a single error will cause a rejection. If the credentials are correct, you must then log into your Twilio Console and check the Voice Geo-Permissions to confirm that outbound calling is enabled for both the country code of your Twilio number and the country code of the destination number you are trying to reach, as new or trial accounts often have restrictive defaults.