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Denial Events
148 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
Troubleshooting
● Check Communication Manager administration (network generated the Cause Value).
- B-channels might be assigned off a T1/E1 into a trunk group that are not available for
service from the remote end. Contact the ISDN service provider to find out which
B-channels can be used.
● Check administration that might cause Communication Manager to generate this Cause
Value.
- If all of the B-channels in a span are busied out or otherwise tied up by switch
maintenance but the D-channel is still up, an incoming call is rejected with this Cause
Value because the call cannot be negotiated to another span.
Cause Value 35
[0x23/0xA3] -
Non-existent closed user group (1TR6: AT&T ISDN Protocol)
The packet mode call was rejected because the equipment sending the Cause Value does not
recognize the requested Closed User Group (CUG), which is a feature associated with packet
mode calls similar to X.25 connection made over the ISDN D-channel.
Communication Manager does not support packet mode sessions on D-channels, therefore this
is not applicable to Communication Manager.
Cause Value 37
[0x25/0xA5] -
Semi-permanent connection not permitted (1TR6: AT&T ISDN Protocol)
Cause Value 38
[0x26/0xA6] -
Network out of order
The call was not completed because the ISDN network is not functioning correctly, and the
condition is likely to last a relatively long period of time. Immediately reattempting the call will
probably be unsuccessful.
Cause Value 39
[0x27/0xA7] -
Permanent frame mode connection out of service
This appears to be a Q.933 frame relay Cause Value. Equipment failure might have caused
termination of a frame relay PVC.
Not applicable to a Communication Manager system.