Hi there how to fix this 'An error occurred in this call: call.in-progress.error-providerfault-outbound-sip-403-forbidden' i already connected the netherland number we buy from twillio and setup trunk number following this guide https://docs.vapi.ai/advanced/sip/twilio

Add your server’s IP to Twilio’s ACL, ensure SIP credentials are correct, use E.164 format in the SIP URI, and verify DNS resolves Twilio’s trunk domain..

my i know where i can see the "server's IP"?

Yes

Hi, I am also running into this issue. I've made sure to: - Add the server IPs to Twilio ACL - Ensure SIP credentials are correct - Verified DNS resolves the trunk domain What does it mean to use E.164 format in the SIP URI ? @Ron what ended up fixing this for you ?

E.164 format means to use + (country code) (phone number) so for Australian numbers, e.164 is +61 4 1234 5678 for American number it would be +1 (American number format) Basically, what you would dial to make an international call.

Thanks @swiftnets . What does it mean to use it in the SIP URI though?