Cisco Cisco Expressway Maintenance Manual
n
H.323 Assent call signaling port; default is 2776
n
H.323 H.460.18 call signaling port; default is 2777
Note that media demultiplexing ports are allocated from the general range of traversal media ports.
Configuring ports for connections from traversal clients
Each traversal server zone specifies an H.323 port and a SIP port to use for the initial connection from the
client. Each time you configure a new traversal server zone on the Expressway-E, you are allocated default
port numbers for these connections:
client. Each time you configure a new traversal server zone on the Expressway-E, you are allocated default
port numbers for these connections:
n
H.323 ports start at UDP/6001 and increment by 1 for every new traversal server zone.
n
SIP ports start at TCP/7001 and increment by 1 for every new traversal server zone.
You can change these default ports if necessary but you must ensure that the ports are unique for each
traversal server zone. After the H.323 and SIP ports have been set on the Expressway-E, matching ports
must be configured on the corresponding traversal client. Note that:
traversal server zone. After the H.323 and SIP ports have been set on the Expressway-E, matching ports
must be configured on the corresponding traversal client. Note that:
n
The default port used for the initial connections from MXP endpoints is the same as that used for standard
RAS messages, that is UDP/1719. While you can change this port on the Expressway-E, most endpoints
will not support connections to ports other than UDP/1719, therefore we recommend that you leave this as
the default.
RAS messages, that is UDP/1719. While you can change this port on the Expressway-E, most endpoints
will not support connections to ports other than UDP/1719, therefore we recommend that you leave this as
the default.
n
You must allow outbound connections through your firewall to each of the unique SIP and H.323 ports that
are configured on each of the Expressway-E’s traversal server zones.
are configured on each of the Expressway-E’s traversal server zones.
The following table shows the default ports used for connections to the Expressway-E.
Protocol
Call signaling
Media
Assent
TCP/2776: listening port for H.225 and
H.245 protocols
H.245 protocols
RTP and RTCP media demultiplexing ports are
allocated from the start of the traversal media ports
range: UDP/36000-36001*.
allocated from the start of the traversal media ports
range: UDP/36000-36001*.
H.460.18/19 TCP/1720: listening port for H.225
protocol
TCP/2777: listening port for H.245
protocol
protocol
RTP and RTCP media demultiplexing ports are
allocated from the start of the traversal media ports
range: UDP/36000-36001*.
allocated from the start of the traversal media ports
range: UDP/36000-36001*.
RTP and RTCP media non-demultiplexing ports are
allocated from the remainder of the traversal media
ports range: UDP/36002-59999*.
allocated from the remainder of the traversal media
ports range: UDP/36002-59999*.
SIP
SIP call signaling uses the same port as
used by the initial connection between
the client and server.
used by the initial connection between
the client and server.
Where the traversal client is an Expressway, SIP media
uses Assent to traverse the firewall.
uses Assent to traverse the firewall.
Table 1: Default traversal port connections
* The default media port range is 36000 to 59999. The first 2 ports in the range are used for multiplexed traffic
only (with Large VM deployments the first 12 ports in the range – 36000 to 36011 – are used).
only (with Large VM deployments the first 12 ports in the range – 36000 to 36011 – are used).
The call signaling ports are configured via
Configuration > Traversal > Ports
. The traversal media port
range is configured via
Configuration > Traversal Subzone
.
Cisco Expressway Administrator Guide (X8.1.1)
Page 47 of 343
Firewall traversal
Configuring ports for firewall traversal