Cisco TelePresence - Port Reference; Local VCS Inbound;Outbound Ports

Port reference
The following tables list the IP ports and protocols used by VCS for general services and functions. Also see:
n Microsoft Lync B2BUA port reference [p.397]
n Device authentication port reference [p.399]
n Unified Communications port reference [p.395]
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 VCS can be viewed via the port
usage pages (Maintenance > Tools > Port usage).
When Advanced Networking is enabled, all ports configured on the VCS, including those relating to firewall
traversal, apply to both IP addresses; you cannot configure ports separately for each IP address.
Local VCS inbound/outbound ports
These are the IP ports on the VCS used to receive (inbound) or send (outbound) communications with other
systems.
Service/
function
Purpose VCS port (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).
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.
500 UDP inbound
outbound
not configurable
Clustering IPsec secure communication between
cluster peers.
IP protocol 51
(IPSec AH)
inbound
outbound
not configurable
Reserved 636 inbound not configurable
DNS Sending requests to DNS servers. 1024 - 65535 UDP outbound System > DNS
Gatekeeper
discovery
Multicast gatekeeper discovery. The VCS
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
Listens for inbound H.323 UDP
registrations. If the VCS 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
Configuration >
Protocols > H.323
Table 7: Local inbound/outbound ports
Cisco VCS Administrator Guide (X8.1.1) Page 391 of 507
Reference material
Port reference