Cisco Cisco Expressway
14
H.323 traversal call using Assent
Expressway-C
source port
Expressway-E
listening port
Call direction
Inbound and outbound calls
Open firewall
Private to DMZ
IP address
IP address of
Expressway-C
IP address of
Expressway-E
IP Po
rt
s
Initial RAS
connection
connection
UDP
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 *
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 Expressway-C): default =
36000 to 59999 *
Y
E
= Local Zone > Traversal Subzone > Traversal Media port start to end
(configured on Expressway-E): default =
36000 to 59999 *
* 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).
deployments the first 12 ports in the range – 36000 to 36011 – are used).
Internet
Expressway-C
Expressway-E
DMZ