Cisco Cisco Expressway
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 Expressway (Applications > B2BUA).
been modified, for example, by changes of registry settings or through group policy, on Lync and Lync client, or
configuration on Expressway (Applications > B2BUA).
Purpose
Protocol
IP port
Lync IP port
Signaling to Lync Server
TLS
65072
5061 (Lync signaling destination
port)
port)
Signaling from Lync Server
TLS
65072
Lync ephemeral port
Media
(The Lync B2BUA application should run
on a separate "Gateway" Expressway
and so this range should not conflict with
the standard traversal media port range)
on a separate "Gateway" Expressway
and so this range should not conflict with
the standard traversal media port range)
Note:
The Expressway does not forward
DSCP information that it receives in
media streams.
media streams.
UDP
56000 to 57000
Each call can use
up to 18 ports if
you Enable RDP
Transcoding for
this B2BUA.
up to 18 ports if
you Enable RDP
Transcoding for
this B2BUA.
Increase this range
if you see "Media
port pool
exhausted"
warnings.
if you see "Media
port pool
exhausted"
warnings.
Lync client media ports
Desktop shares from Lync clients to
B2BUA
B2BUA
TCP
56000 to 57000
Lync client RDP ports
Table 14 Between B2BUA and Lync
Purpose
Protocol
B2BUA port
Expressway IP port
Internal communications with
Expressway application
Expressway application
TLS
65070
SIP TCP outbound port on
Expressway
Expressway
Transcoded desktop shares from B2BUA
to internal recipients
to internal recipients
UDP
56000 to 57000
Recipient of media is dependent
on deployment and called alias;
eg. endpoint, TelePresence
Server, Expressway-C
on deployment and called alias;
eg. endpoint, TelePresence
Server, Expressway-C
Table 15 Between B2BUA and Internal Video Network
Purpose
Protocol
B2BUA IP port
Expressway-E IP port
All communications
UDP
56000 to 57000
3478 (media/signaling) *
Table 16 Between B2BUA and Expressway-E Hosting the TURN Server
Ensure that the firewall is opened to allow the data traffic through from B2BUA to Expressway-E.
* On Large systems you can configure a range of TURN request listening ports. The default range is 3478 – 3483.
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Cisco Expressway with Microsoft Lync Deployment Guide
Port Reference