Cisco Cisco Expressway Maintenance Manual
Service/
function
function
Purpose
Expressway port
(default)
(default)
Direction
Configurable via
Non-
multiplexed
media port
range
multiplexed
media port
range
Range of ports used for non-multiplexed
media. Ports are allocated from this
range in pairs, with the first port number
of each pair being an even number.
media. Ports are allocated from this
range in pairs, with the first port number
of each pair being an even number.
The default media traversal port range is
36000 to 59999, and is set on the
Expressway-C at Configuration
> Traversal Subzone. In Large
Expressway systems the first 12 ports in
the range – 36000 to 36011 by default –
are always reserved for multiplexed
traffic. The Expressway-E listens on
these ports. You cannot configure a
distinct range of demultiplex listening
ports on Large systems: they always use
the first 6 pairs in the media port range.
On Small/Medium systems you can
explicitly specify which 2 ports listen for
multiplexed RTP/RTCP traffic, on the
Expressway-E (Configuration >
Traversal > Ports). If you choose not to
configure a particular pair of ports (Use
configured demultiplexing ports = No),
then the Expressway-E will listen on the
first pair of ports in the media traversal
port range (36000 and 36001 by
default).
36000 to 59999, and is set on the
Expressway-C at Configuration
> Traversal Subzone. In Large
Expressway systems the first 12 ports in
the range – 36000 to 36011 by default –
are always reserved for multiplexed
traffic. The Expressway-E listens on
these ports. You cannot configure a
distinct range of demultiplex listening
ports on Large systems: they always use
the first 6 pairs in the media port range.
On Small/Medium systems you can
explicitly specify which 2 ports listen for
multiplexed RTP/RTCP traffic, on the
Expressway-E (Configuration >
Traversal > Ports). If you choose not to
configure a particular pair of ports (Use
configured demultiplexing ports = No),
then the Expressway-E will listen on the
first pair of ports in the media traversal
port range (36000 and 36001 by
default).
36002 – 59999 UDP
(Small / Medium
systems)
(Small / Medium
systems)
or
36012 – 59999 UDP
(Large systems)
(Large systems)
inbound
outbound
outbound
Configuration >
Traversal Subzone
Traversal Subzone
TURN relay
media port
range
media port
range
Range of ports available for TURN media
relay.
relay.
24000 – 29999 UDP
inbound
outbound
outbound
Configuration >
Traversal > TURN
Traversal > TURN
Table 11 Local inbound/outbound ports (continued)
Note that two services or functions cannot share the same port and protocol; an alarm will be raised if you attempt to
change an existing port or range and it conflicts with another service.
change an existing port or range and it conflicts with another service.
* On Large systems you can configure a range of TURN request listening ports. The default range is 3478 – 3483.
Remote Listening Ports
These tables show the default listening (destination) ports on the remote systems with which the Expressway
communicates.
communicates.
The source port on the Expressway for all of these communications is assigned from the Expressway's ephemeral
range.
range.
Service/
function
function
Purpose
Destination port
(default)
(default)
Configurable via
DNS
Requests to a DNS server.
53 UDP
System > DNS
External manager
Outbound connection to an external
manager, for example Cisco TMS.
manager, for example Cisco TMS.
80 TCP
System > External
manager
manager
Table 12 Remote listening ports
258
Cisco Expressway Administrator Guide