Cisco Cisco Expressway
10
SIP traversal call
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
SIP signaling
TCP & TLS A
25000 to 29999
TCP and TLS B
7001
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 *
A = Protocols > SIP > TCP Outbound port start to end: default = 25000 to 29999
B = Zones > Traversal Client > SIP port, typically 7001 for first traversal zone, 7002
for second etc.
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