Cisco Cisco TelePresence Video Communication Server Expressway
Prerequisites prior to configuring VCS and Lync to
interoperate
interoperate
Before configuring the video network and the Lync environment to interwork, make sure that:
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The “Lync gateway” VCS (cluster peers) are running X8.1 code (or later)
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The “Lync gateway” VCS (cluster peers) have at least an option key for non-traversal calls applied.
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The version of Lync is Lync 2010 or Lync 2013.
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Lync is configured and operational and access is available to Active Directory for managing users.
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The FQDN of all Lync servers is resolvable via the DNS server that the “Lync gateway” VCS is configured
to use (this should be the DNS server used by Lync).
to use (this should be the DNS server used by Lync).
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The FQDNs of each of the “Lync gateway” VCSs and if clustered, the FQDN of the “Lync gateway” cluster
must be resolvable via DNS (with round-robin A-records).
must be resolvable via DNS (with round-robin A-records).
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Validation of the Front End Servers on all Lync Directors and Lync FEPs must show no errors. Use the
Topology Validation Tool which can be found in the Lync Resource Toolkit.
Topology Validation Tool which can be found in the Lync Resource Toolkit.
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If TLS is to be used (recommended) ensure that the DNS server supports reverse DNS lookup (often
supported using PTR records).
supported using PTR records).
Benefits of using the B2BUA over legacy OCS Relay
The Lync B2BUA is the preferred method of integrating Lync with VCS. It was introduced in VCS X7. It
provides an interface between Lync and the video network and replaces the legacy OCS Relay application
(removed from VCS in X8.1).
provides an interface between Lync and the video network and replaces the legacy OCS Relay application
(removed from VCS in X8.1).
The B2BUA is a new application that expands upon the feature set of OCS Relay by providing:
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improved stability, speed and performance
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greatly enhanced logging/diagnostics capabilities (using the "Diagnostics logging" functionality of the VCS)
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improved ease of use (B2BUA does not require complex CPL to be installed on the VCS, which was
required with OCS Relay)
required with OCS Relay)
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improved configuration and control (B2BUA has a variety of available configuration settings whereas OCS
Relay was limited in terms of configuration options)
Relay was limited in terms of configuration options)
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support for Lync clients registered via an Edge server (requires a VCS Expressway and the Microsoft
Interoperability option key)
Interoperability option key)
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TURN/ICE support embedded into the B2BUA (requires VCS Expressway and the Microsoft
Interoperability option key)
Interoperability option key)
Microsoft Lync and Cisco VCS Deployment Guide (X8.1)
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Introduction