Cisco Cisco Expressway Maintenance Manual
Port reference
The following tables list the IP ports and protocols used by Expressway for general services and functions.
Also see:
Also see:
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The tables show the generic defaults for each service, many of which are configurable. The actual services
and ports used on your system will vary depending on its configuration, the option keys installed and features
that have been enabled. A specific list of all the IP ports in use on a particular Expressway can be viewed via
the port usage pages (
and ports used on your system will vary depending on its configuration, the option keys installed and features
that have been enabled. A specific list of all the IP ports in use on a particular Expressway can be viewed via
the port usage pages (
Maintenance > Tools > Port usage
).
When Advanced Networking is enabled, all ports configured on the Expressway, including those relating to
firewall traversal, apply to both IP addresses; you cannot configure ports separately for each IP address.
firewall traversal, apply to both IP addresses; you cannot configure ports separately for each IP address.
Local Expressway inbound/outbound ports
These are the IP ports on the Expressway used to receive (inbound) or send (outbound) communications with
other systems.
other systems.
Service/
function
function
Purpose
Expressway port
(default)
(default)
Direction Configurable via
SSH
Encrypted command line administration.
22 TCP
inbound
not configurable
HTTP
Unencrypted web administration.
80 TCP
inbound
not configurable
NTP
System time updates (and important for
H.235 security).
H.235 security).
123 UDP
outbound not configurable
SNMP
Network management.
161 UDP
inbound
not configurable
HTTPS
Encrypted web administration.
443 TCP
inbound
not configurable
Clustering
IPsec secure communication between
cluster peers.
cluster peers.
500 UDP
inbound
outbound
outbound
not configurable
Clustering
IPsec secure communication between
cluster peers.
cluster peers.
IP protocol 51
(IPSec AH)
(IPSec AH)
inbound
outbound
outbound
not configurable
Reserved
636
inbound
not configurable
DNS
Sending requests to DNS servers.
1024 - 65535 UDP
outbound
System > DNS
Gatekeeper
discovery
discovery
Multicast gatekeeper discovery. The
Expressway does not listen on this port
when H.323 Gatekeeper Auto discover
mode is set to Off (this disables IGMP
messages).
Expressway does not listen on this port
when H.323 Gatekeeper Auto discover
mode is set to Off (this disables IGMP
messages).
1718 UDP
inbound
not configurable
H.323
registration
Clustering
registration
Clustering
Listens for inbound H.323 UDP
registrations. If the Expressway is part of a
cluster, this port is used for inbound and
outbound communication with peers, even
if H.323 is disabled.
registrations. If the Expressway is part of a
cluster, this port is used for inbound and
outbound communication with peers, even
if H.323 is disabled.
1719 UDP
inbound
outbound
outbound
Configuration >
Protocols > H.323
Protocols > H.323
Table 3: Local inbound/outbound ports
Cisco Expressway Administrator Guide (X8.1)
Page 254 of 344
Reference material
Port reference