I am trying to Create a SIP trunk credential in Vapi using nvoip as a provider. And all i get is "Couldn't validate SIP trunk credential. SIP gateway creation failed.","error":"Bad Request","statusCode":400" I confirmed with them and there's no ip block on their side. Can someone help with this?

Make sure "provider" is set to "byo-sip-trunk", use valid SIP IPs in "gateways", include "outboundAuthenticationPlan", and confirm all vapi IPs are whitelisted on NVoIP’s side..