Cisco TelePresence Video Communication Server Administrator's Manual page 270

Service/ Description
function
Gatekeeper Used for multicast
discovery gatekeeper discovery.
Note that the VCS
does not listen on this
port when H.323
Gatekeeper Auto
discover mode is set
to Off (this has the
effect of disabling
IGMP messages).
Clustering Used for
communication
between cluster peers
Clustering Used to recover from
intra-cluster
communication failure
Clustering Used for IPsec secure
communication
between cluster peers.
H.323 Listens for inbound
registration H.323 UDP
Clustering registrations. If the
VCS is part of a
cluster, this port is also
used for inbound and
outbound
communication with
peers, even if H.323 is
disabled.
H.323 call Listens for H.323 call
signaling signaling.
Traversal Used on the VCS
server media Expressway for
demultiplexing demultiplexing RTP
RTP media.
Cisco VCS Administrator Guide (X6.1)
Default Direction Available
1718 UDP inbound
4369-4380 inbound
TCP outbound
4371 UDP inbound
500 UDP inbound
1719 UDP inbound
outbound
1720 TCP inbound
2776 UDP inbound
outbound
Reference material
Configurable via
range
not
configurable
not
configurable
not
configurable
not
configurable
1024 - 65534 VCS configuration >
Protocols > H.323
xConfiguration
H323 Gatekeeper
Registration UDP
Port
1024 - 65534 VCS configuration >
Protocols > H.323
xConfiguration
H323 Gatekeeper
CallSignaling
TCP Port
1024 - 65534 VCS configuration >
Expressway > Ports
xConfiguration
Traversal Server
Media
Demultiplexing
RTP Port
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