Cisco Cisco TelePresence Video Communication Server Expressway
16
H.323 call with a non-registered endpoint with public IP
VCS Expressway
source port
Internet endpoint
server (listening) port
VCS Expressway
server (listening) port
Internet endpoint
source port
Call direction
Outbound to an endpoint in the Internet
Inbound from an endpoint in the Internet
Open firewall
DMZ to Internet
Internet to DMZ
IP address
IP address of
VCS Expressway
Any IP address
IP address of
VCS Expressway
Any IP address
IP Po
rt
s
Initial RAS
connection
connection
-
-
-
-
Q 931 / H.225
signaling
signaling
TCP P
15000 to 19999
TCP G
1720
TCP M
1720
TCP K
1720
H.245
TCP P
15000 to 19999
TCP H
>= 1024
TCP P
15000 to 19999
TCP H
>= 1024
RTP
UDP Y
E
50000 to 52399
UDP E
>= 1024
UDP Y
E
50000 to 52399
UDP E
>= 1024
RTCP
UDP Y
E
50000 to 52399
UDP E
>= 1024
UDP Y
E
50000 to 52399
UDP E
>=1024
public
Internet
P = Protocols > H.323 > Gatekeeper > Call
signaling port range start to end: default =
15000 to 19999
15000 to 19999
G = Endpoint signaling port, specified by
a) IP Port in call request
b) DNS lookup for URI to call
c) 1720 if IP address but no port specified
Can be: any port >= 1024, typically 1720
b) DNS lookup for URI to call
c) 1720 if IP address but no port specified
Can be: any port >= 1024, typically 1720
M = Protocols > H.323 Call signaling TCP port:
default = 1720
K = Endpoint signaling port: any port >= 1024,
typically 1720
H = Endpoint H.245 signaling port:
= any IP port >= 1024
= 15000 to 19999 to another VCS
= 5555 to 5574 for MXP static setting
= 11000 to 65000 for MXP dynamic setting
= 15000 to 19999 to another VCS
= 5555 to 5574 for MXP static setting
= 11000 to 65000 for MXP dynamic setting
Y
E
= Local Zone > Traversal Subzone >
Traversal Media port start to end
(configured on VCS Expressway): default =
50000 to 52399
(configured on VCS Expressway): default =
50000 to 52399
E = Endpoint media port range; value used is
specified in codec negotiations:
= any IP port above 1024
= 50000 to 52399 for another VCS
= 2326 to 2385 for MXP static setting
= 11000 to 65000 for MXP dynamic setting
= any IP port above 1024
= 50000 to 52399 for another VCS
= 2326 to 2385 for MXP static setting
= 11000 to 65000 for MXP dynamic setting
VCS Control
VCS Expressway
DMZ