Below possible options for troubleshooting inbound telephony
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Inbound number (DID) not bound to correct Distribution Group Check your Distribution Group IP address settings in Voice Management App.
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Firewall 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):
- 31.169.58.10
- 31.169.58.11
Inbound20
- 188.94.185.98
- 188.94.185.99
- 188.94.185.110
- 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.
