Version 6.4 611 March 2012
SIP User's Manual A. Configuration Parameters Reference
Parameter Description
Web: Enable X-Channel
Header
EMS: X Channel Header
[XChannelHeader]
Determines whether the SIP X-Channel header is added to SIP
messages for providing information on the physical Trunk/B-channel
on which the call is received or placed.
[0] Disable = X-Channel header is not used (default).
[1] Enable = X-Channel header is generated by the device and
sent in INVITE messages and 180, 183, and 200 OK SIP
responses. The header includes the Trunk number, B-channel,
and the device's IP address.
For example, 'x-channel: DS/DS1-5/8;IP=192.168.13.1', where:
'DS/DS-1' is a constant string
'5' is the Trunk number
'8' is the B-channel
'IP=192.168.13.1' is the device's IP address
Web/EMS: Progress Indicator
to IP
[ProgressIndicator2IP]
For Analog (FXS/FXO) interfaces:
[-1] Not Configured (default) = Default values are used. The
default for FXO interfaces is 1; The default for FXS interfaces is 0.
[0] No PI = For IP-to-Tel calls, the device sends a 180 Ringing
response to IP after placing a call to a phone (FXS) or PBX (FXO).
[1] PI = 1, [8] PI = 8: For IP-to-Tel calls, if the parameter
EnableEarlyMedia is set to 1, the device sends a 183 Session
Progress message with SDP immediately after a call is placed to a
phone/PBX. This is used to cut-through the voice path before the
remote party answers the call. This allows the originating party to
listen to network Call Progress Tones (such as ringback tone or
other network announcements).
For Digital interfaces:
[-1] Not Configured = for ISDN spans, the progress indicator (PI)
that is received in ISDN Proceeding, Progress, and Alerting
messages is used as described in the options below. (default)
[0] No PI = For IP-to-Tel calls, the device sends 180 Ringing SIP
response to IP after receiving ISDN Alerting or (for CAS) after
placing a call to PBX/PSTN.
[1] PI =1, [8] PI =8: For IP-to-Tel calls, if the parameter
EnableEarlyMedia is set to 1, the device sends 180 Ringing with
SDP in response to an ISDN Alerting or it sends a 183 Session
Progress message with SDP in response to only the first received
ISDN Proceeding or Progress message after a call is placed to
PBX/PSTN over the trunk.
Note: This parameter can also be configured per IP Profile (using the
IPProfile parameter) and Tel Profile (using the TelProfile parameter).
[EnableRekeyAfter181]
Enables the device to send a Re-INVITE with a new (different) SRTP
key (in the SDP) upon receipt of a SIP 181 response ("call is being
forwarded").
[0] = Disable (default)
[1] = Enable
Note: This parameter is applicable only if SRTP is used.
[NumberOfActiveDialogs]
Defines the maximum number of active SIP dialogs that are not call
related (i.e., REGISTER and SUBSCRIBE). This parameter is used to
control the Registration/Subscription rate.
The valid range is 1 to 20. The default value is 20.
[0] = Only use coders from the coder list (default).
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