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ASAI and Call Control
4-2 Issue 7 May 1998
Call Control capabilities are accepted only when the call is in the proper call state
with respect to the specified party. The following table specifies which call control
requests are accepted and which are denied, depending on the state of the call or
the affected party. In addition, the ECS restricts Call Control requests based on
the call originator’s and destination’s Class of Restriction (COR).
Third Party
Merge
This controlling capability enables the adjunct to direct the
ECS to merge two controlled calls at a specified station into
one call on behalf of that party.
Third Party
Selective
Drop
This controlling capability enables the adjunct to direct the
ECS to drop a party from the controlled call (that is, a
transferred or conferenced call).
Third Party
Relinquish
Control
This terminating capability enables the adjunct to relinquish
control of a specific call and direct the ECS to stop sending
event reports for this call.
Third Party
Clear Call
This terminating capability enables the adjunct to direct the
ECS to disconnect all parties on a controlled call.
Third Party
Send DTMF
Signals
This capability enables the adjunct to transmit a sequence of
DTMF tones on behalf of a party on the call.
Third Party
Call Ended
This terminating capability is used by the ECS when all
parties on a controlled call are disconnected.
Redirect Call This capability enables the adjunct to direct the ECS to
redirect an alerting call away from the alerting station
extension and route it to another number.
Third Party
Listen
Disconnect
This capability enables the adjunct to disconnect the path of
the listener on an active call.
Third Party
Listen
Reconnect
This capability enables the adjunct to reconnect the
listen-disconnected path of the listener on an active call.
Third Party
Single-Step
Conference
This capability enables the adjunct to add a device into an
existing call.
Event
Reports
See Chapter 3, ‘‘Event Reporting and U-Abort Capabilities.’’
U-Abort
(User Abort)
See Chapter 3, ‘‘Event Reporting and U-Abort Capabilities.’’