Cisco TelePresence Administrator's Manual page 356

Service/ Description
function
Gatekeeper discovery Used for multicast
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 IPsec secure
communication between
cluster peers.
Clustering Used for IPsec secure
communication between
cluster peers.
H.323 registration Listens for inbound H.323
Clustering UDP 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 signaling Listens for H.323 call
signaling.
Traversal server media Used on the VCS
demultiplexing RTP Expressway for
demultiplexing RTP
media.
Assent call signaling Used on the VCS
Expressway for Assent
signaling.
H.460.18 call signaling Used on the VCS
Expressway for H.460.18
signaling.
Cisco VCS Administrator Guide (X7.1)
Default Direction Available
range
1718 UDP inbound not
configurable
IP protocol inbound not
51 outbound configurable
500 UDP inbound not
configurable
1719 UDP inbound 1024 - 65534
outbound
1720 TCP inbound 1024 - 65534
2776 UDP inbound 1024 - 65534
outbound
2776 TCP inbound 1024 - 65534
2777 TCP inbound 1024 - 65534
Reference material
Configurable via
VCS configuration >
Protocols > H.323
xConfiguration H323
Gatekeeper
Registration UDP
Port
VCS configuration >
Protocols > H.323
xConfiguration H323
Gatekeeper
CallSignaling TCP
Port
VCS configuration >
Expressway > Ports
xConfiguration
Traversal Server
Media Demultiplexing
RTP Port
VCS configuration >
Expressway > Ports
xConfiguration
Traversal Server
H323 Assent
CallSignaling Port
VCS configuration >
Expressway > Ports
xConfiguration
Traversal Server
H323 H46018
CallSignaling Port
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