Symptom

When forwarding a call in my Vonage number to my SIP URI, the call is rejected with SIP 403 Forbidden by my SIP endpoint. 

Applies To

• Voice
• SIP

Resolution

Check your SIP endpoint to ensure that the Vonage SIP IP address is whitelisted or allowed. Refer to this list of IPs used for SIP traffic. 

Cause

When the SIP endpoint restricts voice traffic from only specific IP addresses, it will reject calls from  IP addresses that have not been allowed with a SIP response of 403 Forbidden. 

Additional Information

Which IP addresses should I allow when using Communication APIs and SIP Trunking?