Cisco Cisco TelePresence Video Communication Server Expressway
14
H.323 traversal call using H.460.18 / 19 multiplexed media
VCS Control
source port
VCS Expressway
server (listening) port
Call direction
Inbound and outbound calls
Open firewall
Private to DMZ
IP address
IP address of
VCS Control
IP address of
VCS Expressway
IP Po
rt
s
Initial RAS
connection
connection
UDP R
C
1719
UDP D
6001
Q 931 / H.225
signaling
signaling
TCP P
15000 to 19999
TCP M
1720
H.245
TCP P
15000 to 19999
TCP U
2777
H460.18/19 RTP
(traversal media)
UDP Y
C
50000 to 54999
UDP V
2776
H460.18/19 RTCP
(traversal media)
UDP Y
C
50000 to 54999
UDP W
2777
public
Internet
R
C
= Protocols > H.323 > Gatekeeper > Registration UDP port: default = 1719
P = Protocols > H.323 > Gatekeeper > Call signaling port range start to end:
default = 15000 to 19999
D = Zones > Traversal Zone > H.323 port, typically 6001 for first traversal zone,
6002 for second etc.
M = Protocols > H.323 Call signaling TCP port: default = 1720
U = VCS Expressway > Ports > H.323 H.460.18 call signaling port: default = 2777
V = VCS Expressway > Ports > Media demultiplexing RTP port: default = 2776
W = VCS Expressway > Ports > Media demultiplexing RTCP port: default = 2777
Y
C
= Local Zone > Traversal Subzone > Traversal Media port start to end
(configured on VCS Control): default = 50000 to 54999
VCS Control
VCS Expressway
DMZ