Cisco TelePresence Administrator's Manual page 373

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
Clustering H.323 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.
Cisco VCS Administrator Guide (X7.2)
Default Direction Available
range
1718 UDP inbound not
configurable
IP protocol inbound not
51 (IPSec outbound configurable
AH)
500 UDP inbound not
outbound configurable
1719 UDP inbound 1024 - 65534
outbound
1720 TCP inbound 1024 - 65534
2776 UDP inbound 1024 - 65534
outbound
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
Page 373 of 498