Hello, I’m trying to connect my ippi phone number to Vapi using my SIP credentials, but I’m facing an issue when placing calls through Vapi. When I configure my SIP account in Vapi, I am forced to use the server’s IP address instead of the domain sip.ippi.com. Because of this, the SIP messages sent by Vapi use the IP instead of the proper domain, which causes my calls to be rejected with a 403 error. For reference, calling with Zoiper using the same SIP credentials works correctly. Here is the problem as identified by ippi support: The FROM header sent by Vapi is incorrect: From: ; It should be: sip:MY_USERNAME@sip.ippi.com The INVITE request is also incorrect: Vapi sends: INVITE sip:33671514802@194.169.214.30 It should be: INVITE sip:33671514802@sip.ippi.com Because the SIP URI uses the IP instead of sip.ippi.com, ippi’s platform rejects the call. Could you please adjust the SIP configuration so that Vapi uses the domain sip.ippi.com in the FROM header and INVITE URI instead of the IP address? Thank you for your help!

We can make this change on our SIP infra but it will take some time as it requires quite a bit of manual configuration for your org id. If you would like to proceed with this, let us know