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ASAI and Call Control
Issue 7 May 1998
4-43
Third Party Selective Hold
The adjunct uses this capability to place a controlled call on hold at an on-ECS
station. The effect is as if the specified party depressed the hold button on his or
her multifunction terminal to locally place the call on hold, or flashed the switch
hook on an analog terminal.
Information Flow
The adjunct expects a response to its request.
The ECS either:
— Places the call on hold and sends the adjunct an acknowledgement, or
— Denies the request
Third Party Selective Hold Parameters
ACK (Positive Acknowledgement) Parameters
No parameters are contained in the acknowledgement for this capability.
Denial (NAK) Causes
The ECS issues one of the following reasons as the cause for denying the
request:
■ Invalid association (CS0/81)
The association does not exist.
■ Invalid number/domain (CS0/28)
The party_id given is invalid or does not correspond to a station.
■ Message not compatible with call state (CS0/98)
The request is not compatible with the call state. The party to be put on
hold is not currently active (talking), so it cannot be put on hold. Also
applies to analog sets with two calls already on hold.
■ Mandatory Information Element missing (CS0/96)
A required parameter is missing in this request.
party_id Identifies the party to be placed on hold. This party must be
in the active (talking) state or already held.