AudioCodes Mediant 3000 User Manual page 813

User's Manual
Parameter
Generation
[ComfortNoiseNegotiation
]
[SDPEcanFormat]
Web/EMS: First Call
Ringback Tone ID
[FirstCallRBTId]
Version 6.8

[0] Disable

[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.
Note: This parameter is applicable only to the Gateway application.
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 included in
the SDP.
Note: This 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.
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 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).
813
51. Configuration Parameters Reference
Description
Mediant 3000