Below possible options for troubleshooting inbound telephony
- Inbound number (DID) not bound to correct Distribution Group
Check your Distribution Group IP address settings in Voice Management App.
- Firewall or PBX not configured for CM inbound trunk IP addresses
Inbound traffic is routed from our dedicated inbound platform. Please allow incoming traffic from:
InOut00 (Legacy platform):
No correct response to SIP OPTIONS keep alive messages
If a 404 error No Route To Destination | No More Destinations error response is received. Our platform is sending so called Keep Alive messages via SIP OPTIONS message which need to be acknowledged by a 200 OK from customer PBX instance.
This is the principle by which our gateways check if the inbound trunk is still available.
After updating your config, please wait 3-5 minutes before retesting since our platform requires 3 successful responses.
- Inbound number format
The number format for inbound calls is always with the "+" symbol.