Cisco Cisco TelePresence Video Communication Server Expressway
30
SIP B2BUA and Microsoft Lync
VCS B2BUA
Lync Edge Server
Lync Front-End
Internet
Expressway
Internal Firewall
External Firewall
“Lync gateway”
VCS Control
VCS Control
VCS Expressway
Public IP only
NAT not supported
3478, 24000 – 29999 * inbound
UDP if the Expressway is used for
media only to NAT
Public NAT supported on Expressway
Expressway IP can be private
Only Internal IP needed
3478 * outbound UDP from
B2BUA to Expressway
(assumes response back allowed)
3478 outbound UDP required
Lync Client
Lync Client
* On Large VCS VM server deployments you can configure a range of TURN request listening
ports (3478 to 3483) . For new installations of X8.1 or later, the default range for TURN relay
media ports is 24000 – 29999. The previous default range of 60000 – 61799 still applies to
earlier releases that have upgraded to X8.1.
ports (3478 to 3483) . For new installations of X8.1 or later, the default range for TURN relay
media ports is 24000 – 29999. The previous default range of 60000 – 61799 still applies to
earlier releases that have upgraded to X8.1.