Purpose
Protocol
Edge server
Lync client
STUN
UDP
3478
3478
UDP Media
UDP
50000-59999
1024-65535
TCP Media
TCP
50000-59999
1024-65535
External Lync client / Edge server and VCS Expressway
Purpose
Protocol
Lync client / Edge
server
VCS Expressway
ICE messaging (STUN/TURN) if media
is sent via the VCS Expressway
UDP
3478
3478
UDP media if it is sent via the VCS
Expressway
UDP
1024-65535
24000-29999 **
** The default TURN relay media port range of 24000 – 29999 applies to new installations of X8.1 or later. The
previous default range of 60000 – 61799 still applies to earlier releases that have upgraded to X8.1.
Between B2BUA and transcoder
Purpose
Protocol
B2BUA IP port
Transcoder
B2BUA communications with transcoder
(Cisco AM GW)
TLS
65080
5061
Cisco VCS Administrator Guide (X8.1.1)
Page 398 of 507
Reference material
Microsoft Lync B2BUA port reference