AudioCodes Mediant 800 User Manual page 1298

CHAPTER 72 Configuration Parameters Reference
Parameter
configure voip >
sip-definition
settings > sdp-
ecan-frmt
[SDPEcanFormat]
'First Call Ringback Tone
ID'
configure voip >
sip-definition
settings > 1st-
call-rbt-id
[FirstCallRBTId]
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.
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: 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.
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).
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Mediant 800 Gateway & E-SBC | User's Manual
Description