Cause value 17

Last Updated : Oct 14, 2014 |
[0x11/0x91]

User busy/ Requested facility not subscribed (1TR6: AT&T ISDN Protocol)

Cause

Cause value 17 indicates that the dialed endpoint is unable to accept another call.

Cause value 17 (1TR6) indicates that the call cannot be completed because the user has not subscribed to the service, feature, or supplementary service requested in the SETUP message.

This cause value has end-to-end significance. Communication Manager returns this cause value to the user who has originated the call.

See also Cause value 16 and Cause value 31.

Proposed Solution

Procedure

  1. Wait and redial the number later.
  2. If the user has subscribed to the service, feature, or supplementary service, complete the ordering process with the ISDN service provider.
  3. Check Cause Value Information Element (LOC).
    1. If the location information of the Cause Value is 4, public network serving the remote user, the trunk group to the remote endpoint location is experiencing an all-trunks-busy condition or not enough channels are allocated into a virtual group for the particular NSF of the call.
    2. If the location information of the Cause Value is 0, user, the endpoint is busy.
  4. If Communication Manager is generating this cause value and the endpoint is not busy, check the following Communication Manager administrations.
    1. Trunk group screen: Usage Allocation is y on the CBC Service Type field. Not enough incoming channels have been allocated for the NSF associated with this call.
    2. VDNs and Call vectoring: Analyze the vector processing and the call flow to determine the cause of the failure. Incorrect VDN vector administration sends the call to a busy vector step. The call goes to a skill/Automatic Call Distribution (ACD) group queue that is full and cannot accept any more calls. Look Ahead Interflow/Best Service Routing (LAI/BSR) receives an inappropriate ISDN response while checking other sites for available agents, and returns a busy status to the caller. The LAI/BSR attempt interacts with the public network features: Egress on busy – overflow to POTS, Alternate Destination Routing (ADR), and Alternate Destination Call Redirection (ADCR).
    3. Trunk and/or station Class of Restriction (COR) prevents the endpoint to terminate the call.
    4. The endpoint has the call forward feature enabled, and this is the second call within the 30-second time limit on a station that is forwarding this call.