Cause
Cause value 34 indicates that the call cannot be completed because there is no appropriate circuit or channel available to handle the call request, or the ISDN network is congested.
Communication Manager generates this cause value when a call is sequenced through
Communication Manager, and the trunk group to be used for the outgoing call is:
In all-trunks-busy condition
Unavailable for service
Unreachable from the incoming trunk group due to Class of Restriction (COR), FRL, trunk-to-trunk transfer restrictions, or disconnect supervision restrictions
Cause value 34 (1TR6) indicates that the packet mode call is rejected because the user is not a member of a Closed User Group (CUG) at the remote end, 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.
This cause value has end-to-end significance. Communication Manager returns this cause value to the user who has originated the call.
Proposed Solution
Procedure
- Check Communication Manager administration for the cause value generated by the network.
- B-channels are assigned off a T1/E1 to 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 for the cause value generated by Communication Manager.
- 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 functioning, an incoming call is rejected with this cause value because the call cannot be negotiated to another span.
