Cisco Cisco Expressway
Lync Server Versions
The known differences in interoperability when Expressway integrates with Microsoft Lync Server 2013 or Lync
Server 2010 are summarized below:
Server 2010 are summarized below:
Microsoft Lync Server 2010
The Microsoft Interoperability option key must be installed to enable encrypted calls to and from Microsoft Lync
2010 Server (for both native SIP calls and calls interworked from H.323). It is also required by the B2BUA when
establishing ICE calls to Lync 2010 clients.
2010 Server (for both native SIP calls and calls interworked from H.323). It is also required by the B2BUA when
establishing ICE calls to Lync 2010 clients.
The B2BUA can use the Cisco AM GW to transcode between standard codecs (such as H.264) and Microsoft RT
Video and RT Audio to allow high definition calls between Microsoft Lync 2010 clients and Cisco endpoints.
Video and RT Audio to allow high definition calls between Microsoft Lync 2010 clients and Cisco endpoints.
Screen sharing from Lync clients towards video network endpoints is not supported on Lync Server 2010.
Microsoft Lync Server 2013
The B2BUA provides interworking between standard H.264 AVC and Lync 2013's H.264UC SVC codec. You can still
configure the B2BUA to use Cisco AM GW transcoders with Lync 2013, but it is not necessary and we recommend
that they are not deployed with Lync 2013.
configure the B2BUA to use Cisco AM GW transcoders with Lync 2013, but it is not necessary and we recommend
that they are not deployed with Lync 2013.
Lync 2013 no longer supports H.263, so X8.1 or later software is required to interoperate successfully with Lync
2013.
2013.
The Microsoft Interoperability option key is required for all types of communication with Lync 2013.
Skype for Business Server
Not supported.
Video Codecs
If you use Lync 2010 for Windows, the other video endpoints must support H.263; this is the common video codec
supported by endpoints and the Lync client. (Lync 2010 for Windows does not support H.264)
supported by endpoints and the Lync client. (Lync 2010 for Windows does not support H.264)
The Lync 2010 client for Apple Mac OS X only supports RTVideo. It does not support H.263 or H.264. To make video
calls between this client and Cisco Collaboration video endpoints, you need the Cisco AM GW to transcode between
RTVideo and H.263/H.264.
calls between this client and Cisco Collaboration video endpoints, you need the Cisco AM GW to transcode between
RTVideo and H.263/H.264.
Video codec selection
When the B2BUA receives a call with no SDP—that is, without a list of codecs that can be used for the call (for
example, a call that has been interworked from H.323)—the B2BUA must populate the SDP with a "pre-configured"
list of codecs from which Lync can select, as Lync does not support INVITES with no SDP.
example, a call that has been interworked from H.323)—the B2BUA must populate the SDP with a "pre-configured"
list of codecs from which Lync can select, as Lync does not support INVITES with no SDP.
The codecs offered and selected, therefore, may not reflect the best codecs that could have been selected by the
endpoints.
endpoints.
Conferencing
Cisco TelePresence Server
Supported Lync clients can join conferences hosted on a TelePresence Server.
The TelePresence Server must be trunked to Unified CM or controlled by a TelePresence Conductor that is trunked to
Unified CM.
Unified CM.
Lync users can share their screen in a TelePresence Server conference. They will receive presentation from other
participants in the composited video stream from the TelePresence Server.
participants in the composited video stream from the TelePresence Server.
Cisco TelePresence MCU Series
Supported Lync clients can join conferences hosted on a MCU.
The MCU must be trunked to Unified CM or controlled by a TelePresence Conductor that is trunked to Unified CM.
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Cisco Expressway with Microsoft Lync Deployment Guide