Direct SIP

Remote users can place SIP calls from Microsoft Office Communicator or Lync clients.

Microsoft®-certified direct SIP connectivity between Mitel® Communications Director (MCD) and Microsoft Office Communications Server (OCS) 2007 R2 and Microsoft Lync™ 2010 Server allows end-users to establish calls from a Microsoft Office Communicator or Lync client, acting as a basic SIP softphone, to or from a Mitel desk phone, the public switched telephone network (PSTN), or any other network-connected PBX.

Users can dial through the find field, through a contact list, or through the Microsoft Office suite of products as defined by the Microsoft server specifications. All telephony services for the Communicator softphone are provided by OCS 2007 R2 or Lync. There is no integration between the Communicator or Lync client and a Mitel desk phone; if this is required, then Mitel Live Business Gateway and remote call control should be used.

Mitel is a certified PBX vendor for direct SIP connection.

http://technet.microsoft.com/en-us/lync/gg131938.aspx#tab=1

Direct SIP is supported with OCS 2007 R2 and Lync using MCD 4.2 SP1.

For information on product and application interoperability, please contact your nearest Mitel office.