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ASAI and Call Control
4-6 Issue 7 May 1998
Denial (NAK) Causes
The following causes may be issued for non-Switch-Classified calls. For NAKs for
Switch-Classified calls, see ‘‘Third Party Make Call and Supported Call Types’’
that follows.
■ Invalid association (CS0/81)
The association does not exist.
■ Requested facility not subscribed/provisioned (CS0/50)
The user has not subscribed for the requested capability.
■ Out of Service (CS3/27)
The originator of the call is out of service.
■ ECS Equipment Congestion (CS0/42)
The ECS equipment is experiencing congestion due to traffic overload.
■ Call Rejected (CS0/21)
The COR check for completing the call failed.
■ Mandatory Information Element missing (CS0/96)
A required parameter is missing in the request.
■ Resources not available (CS3/40)
— The request cannot be executed because a call classifier is not
available or no trunks are available in the requested trunk group.
— The maximum number of calls being controlled has been exceeded.
■ Incompatible Options (CS3/80)
The designated call options are not compatible with the Third Party Make
Call request.
■ User busy (CS0/17)
The user is busy on another call and cannot originate this call.
■ No user responding (CS0/18)
The originating address does not pick up the call and cannot be forced
off-hook.
■ Invalid number/domain (CS0/28)
An invalid address or extension number is present in the request.
■ Agent not member of split (CS3/11)
The agent is not a member of the split in this Direct Agent call.
■ Agent not logged in (CS3/15)
The agent is not currently logged into a split for this Direct Agent call.
■ Bearer capability not presently available (CS0/58)
There are incompatible bearer services for the originating or destination
addresses. For example, the originator is administered as a data hotline
station or the destination is a data extension.