Version 5.8 333 October 2009
SIP User's Manual 6. Configuration Parameters Reference
Parameter Description
To: <sip:notavailable@unknown.invalid>;tag=svw-0-
1229428367
Call-ID: ConorCCR-0-LU-1229417827103300@dtas-
stdn.fs5000group0-000.l
CSeq: 1 INFO
Contact: sip:10.20.7.70:5060
Content-Type: application/On-Hook (application/Off-Hook)
Content-Length: 0
Notes:
 This parameter is applicable only if the parameter
RegretTime is configured.
 This parameter is applicable only to FXS interfaces.
Web/EMS: First Call Ringback Tone
ID
[FirstCallRBTId]
Determines the index of the first Ringback Tone in the CPT
file. This option enables an Application server to request the
device to play a distinctive Ringback tone to the calling party
according to the destination of the call. The tone is played
according to the Alert-Info header received in the 180
Ringing SIP response (the value of the Alert-Info header is
added to the value of this parameter).
The valid range is -1 to 1,000. The default value is -1 (i.e.,
play standard Ringback tone).
Notes:
 It is assumed that all Ringback Tones are defined in
sequence in the CPT file.
 In case of an MLPP call, the device uses the value of this
parameter plus 1 as the index of the Ringback tone in the
CPT file (e.g., if this value is set to 1, then the index is 2,
i.e., 1 + 1).
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