SIP User's Manual 174 Document #: LTRT-68806
Mediant 2000 & TP-1610 & TP-260/UNI
Table 5-34: Media Settings, RTP / RTCP Parameters
Parameter Description
Comfort Noise Generation
Negotiation
[ComfortNoiseNegotiation]
Enables negotiation and usage of Comfort Noise (CN).
 [0] Disable = Disable (default).
 [1] Enable = Enable Comfort Noise negotiation
The use of CN is indicated by including a payload type for CN on
the media description line of the SDP. The gateway can use CN
with a codec whose RTP timestamp 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.
Note: Silence Suppression must be enabled to generate CN.
RTP Base UDP Port
[BaseUDPPort]
Lower boundary of UDP port used for RTP, RTCP (Real-Time
Control Protocol) (RTP port + 1) and T.38 (RTP port + 2). The
upper boundary is the Base UDP Port + 10 * (number of gateway's
channels).
The range of possible UDP ports is 6,000 to 64,000. The default
base UDP port is 6000.
For example: If the Base UDP Port is set to 6000 (the default)
then:
1) The first channel uses the following ports: RTP 6000, RTCP
6001 and T.38 6002, 2) the second channel uses: RTP 6010,
RTCP 6011 and T.38 6012, etc.
Note: If RTP Base UDP Port is not a factor of 10, the following
message is generated: 'invalid local RTP port'.
For detailed information on the default RTP/RTCP/T.38 port
allocation, refer to the SIP Series Reference Manual.
Remote RTP Base UDP Port
[RemoteBaseUDPPort]
Determines the lower boundary of UDP ports used for RTP, RTCP
and T.38 by a remote gateway. If this parameter is set to a non-
zero value, ThroughPacketâ„¢ is enabled. Note that the value of
RemoteBaseUDPPort on the local gateway must equal the value
of BaseUDPPort of the remote gateway. The gateway uses these
parameters to identify and distribute the payloads from the
received multiplexed IP packet to the relevant channels.
The valid range is the range of possible UDP ports: 6,000 to
64,000.
The default value is 0 (ThroughPacket is disabled).
For detailed information on ThroughPacket, refer to 'RTP
Multiplexing (ThroughPacket) on page 349.
Notes:
 To enable ThroughPacket the parameters
L1L1ComplexTxUDPPort and L1L1ComplexRxUDPPort must
be set to a non-zero value.
 When VLANs are implemented, the ThroughPacket mechanism
is not supported.
RTP Multiplexing Local UDP Port
[L1L1ComplexTxUDPPort]
Determines the local UDP port used for outgoing multiplexed RTP
packets (applies to the ThroughPacketâ„¢ mechanism).
The valid range is the range of possible UDP ports: 6,000 to
64,000.
The default value is 0 (ThroughPacket is disabled).
This parameter cannot be changed on-the-fly and requires a
gateway reset.
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