[cisco-voip] Media Bypass with Microsoft Lync and Cisco UCM

[Ryan Ratliff]

For starters I'd be leery of any 3rd party config guide that refers to CUCM 4.2.  

I don't know that Cisco would support any particular feature with Microsoft Lync.   Whether it will work or not is another question.  Not knowing anything about the MS product I'd say media bypass is like CUBE flow-around.  It means they aren't going to terminate RTP and instead pass through the SDP data from the other side.

Don't see any reason why this wouldn't work as long as they don't mess with the SDP in nasty ways.

-Ryan

On Jan 7, 2011, at 2:45 PM, Matt Slaga (US) wrote:

Does Cisco support media bypass with Microsoft Lync?  Microsoft is a bit cryptic with their explanation below. 
 
Media bypass has been added to Lync Server. Media bypass allows media traffic to bypass the Mediation Server and flow directly from the client (that is, Lync Server) to the gateway or IP-PBX. When media bypass is configured, the signaling traffic continues to flow through the Mediation Server on its path to the gateway; however, media traffic bypasses the Mediation Server and is sent directly to the gateway. Media bypass requires support from specific gateways. These gateways will be listed in the Microsoft Unified Communications Open Interoperability Program.

With media bypass, the Mediation Server role can now be co-located on a front-end server, simplifying deployment and management of Lync Server. This reduction in physical servers helps lower the total cost of ownership. By removing the media workload from the Mediation Server, it can scale higher to support thousands of users.

 
Cisco
Cisco Unified Communications Manager
Direct SIP
UCM 4.2 2000-4-4a
 
Configuration Notes:

1.       On the Cisco IP-PBX, configure MTP to enabled and PRACK to disabled (the default for PRACK). The PRACK message sent by CUCM 4 is malformed by missing the MAXFORWARDS header.
2.       On Lync Mediation Server, Media Bypass is set to enabled. RTCP and REFER are set to disabled, as Cisco doesn't send RTCP messages and REFER is not supported by this IP-PBX.
Known Limitations:

1.       When a Lync user transfers a PBX call to another PBX user, the local PBX phone will still show connected to the first Lync user.
2.       Comfort noise generation is not supported. As a result, comfort noise is not played on Microsoft Lync.
 
Thanks!
 
Matt Slaga
Dimension Data Americas
Matt.slaga at us.didata.com
+1-571-203-4132
 
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