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• Grayed boxes represent devices in a call unaffected by the service or event report.
• White boxes and circles represent devices and calls affected by the service or event report.
• The parameters for the function call of the service are indicated in bold italics.
Answer Call Service
The Answer Call Service is used when an incoming call (C1) is alerting (ringing) a device
(D1) with the connection alertingCall (C1-D1). The effect is the same as if the answering
party answered the call via the telephone on/off button.
Function: cstaAnswerCall( ), CSTAAnswerCallConfEvent
Direction: C → S
Functional Description:
Service Parameters:
Ack Parameters:
Nak Parameter:
4
* = Unspecified
The Answer Call Service allows a client application to request that a call ringing at a sta-
tion be answered. Answering a ringing call means to connect a call if the user is on-hook
by forcing the station off-hook, or, if the user is off-hook, by cutting through the call to the
headset or handset. An active call may be dropped or placed on hold when the new call is
answered (depending on how the extension is programmed).
The deviceID in alertingCall must contain the station extension of the endpoint to be
answered on the call. A Delivered Event Report must have been received by the applica-
tion prior to this request.
The Answer Call Service can be used to answer calls presented to digital telephones only.
The Answer Call Service request is acknowledged (Ack) by the switch if the switch is able
to connect the specified call either by forcing the station off-hook (i.e., turning the speak-
erphone on) or by taking the appropriate action required to handle an existing call.
Answering a call which is already connected will result in a positive acknowledgment and
the call will remain connected.
alertingCall
noData
universalFailure
•
INVALID_CSTA_CONNECTION_IDENTIFIER (13)
An incorrect callID, or an incorrect deviceID is specified.
•
INVALID_OBJECT_STATE (22)
The specified connection at the station is not in the alerting or connected.
Issued April 2000
Section 470 - TSAPI Programmer's Guide
[mandatory] a valid connection identifier indicates the callID
and the station extension (STATIC_ID).
None for this service.
DBS-92-470
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