Cause value 44

Last Updated : Oct 15, 2014 |
[0x2C/0xAC]

Requested circuit/channel not available

Cause

The call cannot be completed because the circuit or the channel requested for use in the SETUP message is not available, and the call cannot be negotiated to another channel either because no other channel is available, or negotiation is not supported or required for this call.

This cause value is generated when a glare condition occurs and B-channel negotiation is not supported.

Communication Manager generates this cause value when:

  • The cause value is generated on the network side of the interface and a glare condition occurs on the requested B-channel.

  • The B-channel requested in the incoming SETUP message is in the incorrect maintenance state of call handling. For example, the B-Channel is busied out or undergoing testing.

Proposed Solution

Procedure

  1. CO switch default settings deactivate channel negotiation support. Make a specific request to activate channel negotiation support when ordering CO service.
  2. Check Communication Manager administration for the cause value generated by the network.
    1. Trunk group form: When the Channel Negotiation field is set to exclusive, Communication Manager requests B-channels for calls without support for negotiation. If the requested B-channel is unavailable at the remote end, 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.