Cisco Cisco TelePresence Video Communication Server Expressway

Purpose

Protocol

B2BUA IP port

VCS Expressway IP port

All communications

UDP

56000 to 57000

3478 (media/signaling) *

Table 15 Between B2BUA and VCS Expressway Hosting the TURN Server

Ensure that the firewall is opened to allow the data traffic through from B2BUA to VCS Expressway.

* On Large systems you can configure a range of TURN request listening ports. The default range is 3478 – 3483.

Purpose

Protocol

Edge server

Lync client

SIP/MTLS used between Lync Client and
Edge server for signaling (including any
ICE messaging to the Edge Server)

TCP

5061

SIP/TLS

TCP

443

STUN

UDP

3478

UDP Media

UDP

50000-59999

1024-65535

TCP Media

TCP

50000-59999

1024-65535

Table 16 External Lync Client and Edge Server

Purpose

Protocol

Lync client / Edge
server

VCS Expressway

ICE messaging (STUN/TURN)

(VCS Expressway must listen on
TCP 3478 for desktop sharing relay
requests from Lync clients, and on
UDP 3478 for A/V media relay requests)

UDP & TCP

3478

UDP media

UDP

1024-65535

24000-29999 **

Table 17 External Lync Client / Edge Server and VCS Expressway

** 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.

Purpose

Protocol

B2BUA IP port

Transcoder

B2BUA communications with transcoder
(Cisco AM GW)

TLS

65080

5061

Table 18 Between B2BUA and External Transcoder

How Many Media Ports are Required on the Gateway VCS?

The UDP port range of the B2BUA on the Gateway VCS is set to 1000 ports by default, starting at 56000 and ending at
57000. That is the default destination range for media from Lync clients, and may be different in your Lync

Cisco VCS and Microsoft Lync Deployment Guide

Port Reference