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Issue with ISDN BRI and CUCM 7

Hi,

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?

1 Accepted Solution

Accepted Solutions

NeverSaidCastle
Level 1
Level 1

I had a similar issue on 2811 BRI ports:

turning to IOS 12.4(24)T2 (ED) worked for me.

View solution in original post

3 Replies 3

paolo bevilacqua
Hall of Fame
Hall of Fame

My recommendation is that you use H.323 or SIP to the GW. There are too many problems and bugs when using MGCP.

NeverSaidCastle
Level 1
Level 1

I had a similar issue on 2811 BRI ports:

turning to IOS 12.4(24)T2 (ED) worked for me.

Yes, it works.

Thanks