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Denial Events
150 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
This Cause Value is usually delivered in a STATUS message. Communication Manager
generates this Cause Value when:
● A tandem call inter-works from ISDN to non-ISDN trunking.
● Calling number and/or calling name information is sent in the SETUP message when it is
not needed.
● Connected number information is sent when the network does not support it.
This Cause Value has end-to-end significance and should always be passed back through the
network to the user.
Check the diagnostic information (DIAG) for the Information Element identifier of the discarded
information. See Cause Values and their meanings/interpretations
on page 128.
Cause Value 44
[0x2C/0xAC] -
Requested circuit/channel not available
The call was not completed because the circuit/channel requested for use in the SETUP
message was not available, and the call could not be negotiated to another channel either
because no other channel was available, or negotiation is not supported or was not wanted for
this call.
This Cause Value is generated when a glare condition is occurring and B-channel negotiation is
not supported.
Communication Manager generates this Cause Value when:
● It is the NETWORK side of the interface and a glare condition is occurring on the
requested B-channel.
● The B-channel requested in the incoming SETUP message is not in the correct
maintenance state to handle a call (for example, it is busied out or undergoing testing).
Troubleshooting
● CO switch default settings turn off channel negotiation support. Make a specific request to
turn on channel negotiation support when ordering CO service.
● Check Communication Manager administration (network generated the Cause Value).
- Trunk group form: When the Channel Negotiation field is set to exclusive,
Communication Manager requests B-channels for calls without support for negotiation so
if at the remote end the requested B-channel is unavailable for whatever reason the call
cannot be negotiated to a more acceptable B-channel and the call will be rejected with
Cause Value 44. Set the Channel Negotiation field to preferred to support channel
negotiation.