Cause value 57

Last Updated : Oct 15, 2014 |
[0x39/0xB9]

Bearer capability not authorized/ Out of order (1TR6: AT&T ISDN Protocol)

Cause

Cause value 57 indicates that the call cannot be completed because the user has requested a bearer capability in the SETUP message which is implemented by the equipment generating this cause value, but the user either has not subscribed to the bearer capability or is not authorized to use the bearer capability.

Cause value 57 (1TR6) indicates that the call cannot be delivered to the remote endpoint because the interface to the endpoint is not functioning properly. There a signaling message is not delivered to the remote device. The delivery fails due to a physical or data link layer failure at the remote device, or the remote device is switched off.

Proposed Solution

Procedure

  1. Check the diagnostic information (DIAG) for the unauthorized bearer capability attributes. See Event data 2.
  2. Check Communication Manager administration (network generated the cause value).
    1. Route pattern: An incorrect ITC or BCIE specified, these fields affect how the bearer capability is encoded in the SETUP message.
    2. The ITC administered on the originating endpoint is incorrect for this call, or the speed options for calls over these ISDN facilities in the device itself are incorrect or both.
    3. Incorrect data speed option set in the BRI device causes a call from a BRI endpoint sequencing through Communication Manager to create a SETUP message with the wrong bearer capability.
    4. A call sequencing through Communication Manager ISDN trunk group to ISDN trunk group has bearer capability that is not supported by the outgoing ISDN facilities or network.
    5. A call sequencing through Communication Manager on a non-ISDN trunk group transferring to an ISDN trunk group has an incorrect bearer capability assigned on the incoming trunk group. The BC and ITC fields to the incoming trunk group are administered incorrectly.