Cisco Cisco TelePresence Video Communication Server Expressway
12
H.323 traversal call using Assent
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 T
2776
H.245
TCP P
15000 to 19999
TCP T
2776
Assent RTP
(traversal media)
UDP Y
C
36002 to 59999 **
UDP Y
E
36000 to 36001 **
Assent RTCP
(traversal media)
UDP Y
C
36002 to 59999 **
UDP Y
E
36000 to 36001 **
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.
T = Traversal > Ports > H.323 Assent call signaling port: default = 2776
Y
C
= Local Zone > Traversal Subzone > Traversal Media port start to end
(configured on VCS Control): default =
36000 to 59999 **
Y
E
= Local Zone > Traversal Subzone > Traversal Media port start to end
(configured on VCS Expressway): default =
36000 to 59999 **
** The default media port range of 36000 to 59999 applies to new installations of X8.1 or
later. The first 2 ports in the range are used for multiplexed traffic only (with Large VM
deployments the first 12 ports in the range – 36000 to 36011 – are used). The previous
default range of 50000 - 54999 still applies to earlier releases that have upgraded to X8.1.
later. The first 2 ports in the range are used for multiplexed traffic only (with Large VM
deployments the first 12 ports in the range – 36000 to 36011 – are used). The previous
default range of 50000 - 54999 still applies to earlier releases that have upgraded to X8.1.
public
Internet
VCS Control
VCS Expressway
DMZ