Version 5.8 293 September 2009
SIP User's Manual 6. Configuration Parameters Reference
6.8.2 Call Waiting Parameters
The call waiting parameters are described in the table below.
Table 6-34: Call Waiting Parameters
Parameter Description
Web/EMS: Enable Call Waiting
[EnableCallWaiting]
Determines whether Call Waiting is enabled.
 [0] Disable = Disable the Call Waiting service.
 [1] Enable = Enable the Call Waiting service (default).
If enabled, when an FXS interface receives a call on a busy
endpoint, it responds with a 182 response (and not with a 486
busy). The device plays a call waiting indication signal. When
hook-flash is detected, the device switches to the waiting call.
The device that initiated the waiting call plays a Call Waiting
Ringback tone to the calling party after a 182 response is
received.
Notes:
 The device's Call Progress Tones (CPT) file must include a
Call Waiting Ringback tone (caller side) and a Call Waiting
tone (called side, FXS only).
 The EnableHold parameter must be enabled on both the
calling and the called side.
 You can use the ini file table parameter CallWaitingPerPort
to enable Call Waiting per port.
 For information on the Call Waiting feature, refer to ''Call
Waiting'' on page 427.
 For information on the Call Progress Tones file, refer to
Configuring the Call Progress Tones File.
EMS: Send 180 For Call Waiting
[Send180ForCallWaiting]
Determines the SIP response code for indicating call waiting.
 [0] = Use 182 Queued response to indicate call waiting
(default).
 [1] = Use 180 Ringing response to indicate call waiting.
Call Waiting Table
[CallWaitingPerPort]
This ini file table parameter configures call waiting per FXS
port. The format of this parameter is as follows:
[CallWaitingPerPort]
FORMAT CallWaitingPerPort_Index =
CallWaitingPerPort_IsEnabled;
[\CallWaitingPerPort]
Where,
 Index = port number (where 0 denotes Port 1).
 IsEnabled:
9 [0] Disable = no call waiting for the specific port.
9 [1] Enable = enables call waiting for the specific port.
When the FXS device receives a call on a busy
endpoint (port), it responds with a SIP 182 response
(and not with a 486 busy). The device plays a call
waiting indication signal. When hook-flash is detected,
the device switches to the waiting call. The device that
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