Microsoft Lync B2BUA port reference
The port numbers listed below are the default port values. The values used in a real deployment may vary if
they have been modified, for example, by changes of registry settings or through group policy, on Lync and
Lync client, or configuration on VCS (Applications > B2BUA).
Between B2BUA and Lync
Purpose Protocol B2BUA IP port Lync IP port
Signaling to Lync Server TLS 65072 5061 (Lync signaling destination
port)
Signaling from Lync Server TLS 65072 Lync ephemeral port
Presence to Lync Server TLS 10011 5061 (Lync signaling destination
port)
Presence from Lync Server TLS 10011 Lync ephemeral port
Media (the Lync B2BUA should be
deployed on a separate "Lync Gateway"
VCS and thus there should be no conflict
with the standard traversal media port
range)
UDP 56000 to 57000 Lync client media ports
Between B2BUA and VCS (internal communications)
Purpose Protocol B2BUA IP port VCS IP port
Internal communications with VCS
application
TLS 65070 SIP TCP outbound port
Between B2BUA and VCS Expressway hosting the TURN server
Purpose Protocol B2BUA IP port VCS Expressway IP port
All communications UDP 56000 to 57000 3478 (media/signaling) *
Ensure that the firewall is opened to allow the data traffic through from B2BUA to VCS Expressway.
* On Large VM server deployments you can configure a range of TURN request listening ports. The default
range is 3478 – 3483.
External Lync client and Edge server
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 5061
SIP/TLS TCP 443 443
Cisco VCS Administrator Guide (X8.1.1) Page 397 of 507
Reference material
Microsoft Lync B2BUA port reference
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