User`s manual

SIP User's Manual 5. Web Management
Version 5.0 159 December 2006
Table 5-44: Media Settings, RTP / RTCP Parameters (continues on pages 158 to 159)
Parameter Description
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:
The first channel uses the following ports: RTP 6000, RTCP 6001 and
T.38 6002,
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 Section
D.3 on page 362.
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,
ThroughPacket™ 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).
Note: To enable ThroughPacket™ the parameters
‘L1L1ComplexTxUDPPort’ and ‘L1L1ComplexRxUDPPort’ must be set
to a non-zero value.
RTP Multiplexing Local UDP Port
[L1L1ComplexTxUDPPort]
Determines the local UDP port used for outgoing multiplexed RTP
packets (applies to the ThroughPacket™ 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.
RTP Multiplexing Remote UDP Port
[L1L1ComplexRxUDPPort]
Determines the remote UDP port the multiplexed RTP packets are sent
to, and the local UDP port used for incoming multiplexed RTP packets
(applies to the ThroughPacket™ 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.
Note: All gateways that participate in the same ThroughPacket™
session must use the same ’L1L1ComplexRxUDPPort’.
Comfort Noise Generation Negotiation
[ComfortNoiseNegotiation]
Enables negotiation and usage of Comfort Noise (CN).
Valid options include:
[0] = Disable (default)
[1] = 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.