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The

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 allows relay support for MS Lync/Skype for business Desktop sharing application media streams. The application sharing media streams are relayed transparently through the
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 over TCP connections. Interactive Connectivity Establishment (ICE) is completed over this TCP connection by the peer endpoint.

When the

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 communicates with an MS Lync/Skype for business client, the
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 expects the TCP connection to be established by the peer endpoint. Hence, the
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 does not initiate the TCP connection on its own. This is an acceptable behavior as the
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 is not situated behind a Network Address Translator (NAT).

The

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 can also be configured to initiate and establish the TCP connection towards the third-party device to support interoperability when the  
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 relays an application sharing media stream. This functionality is supported only when the Lync compatible peer endpoint and the
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 are not situated behind a NAT. 

The

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 includes the following MS Lync/Skype functionality:

  • Application sharing media streams in Session Description Protocol (SDP)
  • Accept and establish TCP connection with media IP/port of the peer application stream
  • Exchange STUN messages over the TCP connection to negotiate ICE
  • Relay desktop share data transparently end-to-end once ICE is completed
Note

If the parameter sourceAddressFiltering is enabled, the

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filters incoming media packets, which do not match the expected source IP address and UDP port. In the Lync desktop sharing, the
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accepts incoming TCP connection that matches any of the source addresses in the candidate lines of the ICE SDP received from the peer. When the
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has not received an SDP from the peer, before the peer attempts to establish the TCP connection, the
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ignores source address filtering and allows the TCP connection to be established on the application sharing stream. 

Note
The existing fields Media Stream Data (230 of STOP record) and Media Stream Stats (231 of STOP record) are updated to log TCP/LYNC/APPSHARE when the SBC accepts a media stream of media type of desktop sharing on protocol TCP/RTP/AVP or TCP/RTP/SAVP. For more information, refer to the section CDR Field Descriptions. 
Note

 The MS Lync/Skype Remote Desktop Sharing feature is supported on the following platforms:

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  • Unable to show "metadata-from": No such page "_space_variables"
  • SWe on KVM
  • SWe on VMware

 

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