User's Manual 1144 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
Parameter Description
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.
Note: The parameter is applicable only to the Gateway application.
configure voip > sip-
definition settings > sdp-
ecan-frmt
[SDPEcanFormat]
Defines the echo canceller format in the outgoing SDP. The 'ecan'
attribute is used in the SDP to indicate the use of echo cancellation.
[0] = (Default) The 'ecan' attribute appears on the 'a=gpmd' line.
[1] = The 'ecan' attribute appears as a separate attribute.
[2] = The 'ecan' attribute is not included in the SDP.
[3] = The 'ecan' attribute and the 'vbd' parameter are not
the SDP.
Note: The parameter is applicable only when the IsFaxUsed
parameter is set to 2, and for re-INVITE messages generated by the
device as result of modem or fax tone detection.
First Call Ringback Tone ID
configure voip > sip-
definition settings > 1st-call-
rbt-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 the parameter).
The valid range is -1 to 1,000. The default is -1 (i.e., play standard
ringback tone).
Note:
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 the 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).
Reanswer Time
configure voip > sip-
definition settings >
reanswer-time
[RegretTime]
Analog: Defines the time interval from when the user hangs up the
phone until the call is disconnected (FXS). This allows the user
up and then pick up the phone (before this timeout) to continue the call
conversation. Thus, it's also referred to as regret time.
Digital: Defines the time period the device waits for an MFC R2
Resume (Reanswer) signal once a Suspend (Clear back) signal is
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