I have a CUCM version 7.0.2 and a Cisco router 2811 as a voice gateway with IOS 12.4(23) spservices.
This router is linked to PSTN (Italy) with ISDN BRI (module VIC2-2BRI-NT/TE).
The protocol that CUCM uses to communicate with the gateway is MGCP.
I notice these problems:
- when an incoming call arrives the phone associated with the public number rings only once but the caller continue to hear ringback tones
- when I try to make an outbound call from the phone, I received a fast busy tone
I check the Partition, Route Pattern and Calling Search Spaces but it seems that these parameters are rightly configured.
I notice that, after executing the command debug isdn q931 on the gateway, there is a log only on incoming calls.
Does anyone help me?