Version 5.8 319 October 2009
SIP User's Manual 6. Configuration Parameters Reference
6.7 SIP Configuration Parameters
This subsection describes the device's SIP parameters.
6.7.1 General SIP Parameters
The general SIP parameters are described in the table below.
Table 6-22: General SIP Parameters
Parameter Description
Web: Max Number of Active Calls
EMS: Maximum Concurrent Calls
[MaxActiveCalls]
Defines the maximum number of simultaneous active calls
supported by the device. If the maximum number of calls is
reached, new calls are not established.
The default value is the maximum available channels (no
restriction on the maximum number of calls). The valid range
is 1 to 12.
Web/EMS: PRACK Mode
[PrackMode]
PRACK (Provisional Acknowledgment) mechanism mode for
1xx SIP reliable responses.
 [0] Disable
 [1] Supported (default)
 [2] Required
Notes:
 The Supported and Required headers contain the '100rel'
tag.
 The device sends PRACK messages if 180/183
responses are received with '100rel' in the Supported or
Required headers.
Web/EMS: Enable Early Media
[EnableEarlyMedia]
Enables the device to send a 183 Session Progress
response with SDP (instead of 180 Ringing), allowing the
media stream to be established prior to the answering of the
call.
 [0] Disable = Early Media is disabled (default).
 [1] Enable = Enables Early Media.
Note that to send a 183 response, you must also set the
parameter ProgressIndicator2IP to 1. If it is equal to 0, 180
Ringing response is sent.
Web: 183 Message Behavior
EMS: SIP 183 Behaviour
[SIP183Behaviour]
Defines the response of the device upon receipt of a SIP 183
response.
 [0] Progress = A 183 response (without SDP) does not
cause the device to play a ringback tone (default).
 [1] Alert = 183 response is handled by the device as if a
180 Ringing response is received, and the device plays a
ringback tone.
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