Cisco Cisco Expressway
Lync users can share their screen in an MCU conference. They will receive presentation from other participants in the
composited video stream from the MCU.
composited video stream from the MCU.
There is a known issue with the MCU which does not revoke the floor after it stops sharing the content from Lync. To
the Lync user it looks like Lync is still sharing the screen, but other participants have stopped seeing the screen.
the Lync user it looks like Lync is still sharing the screen, but other participants have stopped seeing the screen.
Lync Conference (AV MCU) not supported
When a point to point call involves a standards-based endpoint and a Lync client, a third party cannot be invited into
the conference because the Lync client tries to start a Lync conference. The Expressway and the standards-based
endpoints do not support endpoints joining Lync conferences.
the conference because the Lync client tries to start a Lync conference. The Expressway and the standards-based
endpoints do not support endpoints joining Lync conferences.
Configuration
Prerequisites
Lync Environment
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Lync Servers are running Lync Server 2010 or Lync Server 2013.
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Lync is configured and operational and you have access to Active Directory for managing users.
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The Lync Server topology has successfully been validated using the Topology Validation Tool.
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Cisco Collaboration Environment
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The dedicated Gateway Expressway(s) are running X8.1 or later. X8.6 or later is required for Lync screen
sharing. X8.7 or later is required for Lync screen sharing through a clustered Gateway Expressway.
sharing. X8.7 or later is required for Lync screen sharing through a clustered Gateway Expressway.
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The Expressway pair at the network edge is configured as described in Cisco Expressway Basic Configuration
Deployment Guide on the
Deployment Guide on the
■
Unified CM is trunked to the Cisco Expressway-C as described in Cisco Expressway and CUCM via SIP Trunk
Deployment Guide on the
Deployment Guide on the
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The Gateway Expressway(s) have a Rich Media Sessions option key.
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The Gateway Expressway(s) have a Microsoft Interoperability key.
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The Expressway-E must have a TURN Relays option key (for calls from off-site Lync users).
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Unified CM-registered endpoints should be able to call each other.
DNS Records
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The FQDNs of all Lync servers are resolvable by the DNS server used by the Gateway Expressway (Gateway
and Lync Servers should use the same DNS server).
and Lync Servers should use the same DNS server).
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The FQDNs of each Gateway Expressway is resolvable by DNS. If the Gateway Expressway is a cluster, the
FQDN of the cluster must be resolvable by DNS (with a round-robin A-record for each peer).
FQDN of the cluster must be resolvable by DNS (with a round-robin A-record for each peer).
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The DNS server must support reverse DNS lookup (typically by PTR records) if you enable TLS (recommended).
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Cisco Expressway with Microsoft Lync Deployment Guide