SIP User's Manual 614 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description
Generation
[ComfortNoiseNegotiation]
[1] Enable (default)
The use of CN is indicated by including a payload type for CN on the
media description line of the SDP. The device can use CN with a
codec whose RTP time stamp clock rate is 8,000 Hz (G.711/G.726).
The static payload type 13 is used. The use of CN is negotiated
between sides. Therefore, if the remote side doesn't support CN, it is
not used. Regardless of the device's settings, it always attempts to
adapt to the remote SIP UA's request for CNG, as described below.
To determine CNG support, the device uses the
ComfortNoiseNegotiation parameter and the codec’s SCE (silence
suppression setting) using the CodersGroup parameter.
If the ComfortNoiseNegotiation parameter is enabled, then the
following occurs:
If the device is the initiator, it sends a “CN” in the SDP only if the
SCE of the codec is enabled. If the remote UA responds with a
“CN” in the SDP, then CNG occurs; otherwise, CNG does not
occur.
If the device is the receiver and the remote SIP UA does not send
a “CN” in the SDP, then no CNG occurs. If the remote side sends
a “CN”, the device attempts to be compatible with the remote side
and even if the codec’s SCE is disabled, CNG occurs.
If the ComfortNoiseNegotiation parameter is disabled, then the device
does not send “CN” in the SDP. However, if the codec’s SCE is
enabled, then CNG occurs.
Web/EMS: First Call
Ringback Tone ID
[FirstCallRBTId]
Defines 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).
Web: Reanswer Time
EMS: Regret Time
[RegretTime]
For Analog interfaces: Defines the time interval from when the user
hangs up the phone until the call is disconnected (FXS). This allows
the user to hang up and then pick up the phone (before this timeout)
to continue the call conversation. Thus, it's also referred to as regret
time.
For Digital interfaces: Defines the time period the device waits for an
MFC R2 Resume (Reanswer) signal once a Suspend (Clear back)
signal is received from the PBX. If this timer expires, the call is
released. Note that this is applicable only to the MFC-R2 CAS Brazil
variant.
The valid range is 0 to 255 (in seconds). The default value is 0.
Web: Enable Reanswering
Info
[EnableReansweringINFO]
Enables the device to send a SIP INFO message with the On-
Hook/Off-Hook parameter when the FXS phone goes on-hook during
an ongoing call and then off-hook again, within the user-defined
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