User's Manual 574 Document #: LTRT-68822
Mediant 2000
Parameter Description
[TransparentCoderPres
entation]
Determines the format of the Transparent coder representation in the
SDP.
[0] = clearmode (default)
[1] = X-CCD
[IgnoreRemoteSDPMKI]
Determines whether the device ignores the Master Key Identifier (MKI)
if present in the SDP received from the remote side.
[0] Disable (default)
[1] Enable
[TrunkStatusReporting
Mode]
Determines whether the device responds to SIP OPTIONS if all the
trunks pertaining to Trunk Group #1 are down or busy.
[0] Disable (default)
[1] Enable = If all the trunks pertaining to Trunk Group #1 are down
or busy, the device does not respond to received SIP OPTIONS.
Web: Comfort Noise
Generation Negotiation
EMS: Comfort Noise
Generation
[ComfortNoiseNegotiati
on]
Enables negotiation and usage of Comfort Noise (CN).
[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.
[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 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.