3Com VCX v7111 User Manual page 181

Parameter
RTP Base UDP Port
[BaseUDPPort]
Remote RTP Base UDP Port
[RemoteBaseUDPPort]
RTP Multiplexing Local UDP Port
[L1L1ComplexTxUDPPort]
RTP Multiplexing Remote UDP Port
[L1L1ComplexRxUDPPort]
®
3Com VCX V7111 VoIP Gateway User Guide
Description
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 gateways
channels).
The range of possible UDP ports is 6000 to 64000.
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.
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, see Default RTP/RTCP/T.38 Port
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: 6000 to 64000.
The default value is 0 (ThroughPacket™ is disabled).
To enable ThroughPacket™ the parameters
L1L1ComplexTxUDPPort and L1L1ComplexRxUDPPort
must be set to a non-zero value.
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: 4000 to 64000.
The default value is 0 (ThroughPacket™ is disabled).
This parameter cannot be changed on-the-fly and requires a
gateway reset.
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: 6000 to 64000.
The default value is 0 (ThroughPacket™ is disabled).
This parameter cannot be changed on-the-fly and requires a
gateway reset.
All gateways that participate in the same ThroughPacket™
session must use the same L1L1ComplexRxUDPPort.
Allocation.
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