An end user can establish calls from a Microsoft Office Communicator 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. The term PC-to-Phone encompasses calls between PC to PSTN, Phone to PC, and PSTN to PC. This solution is typically used by mobile employees who do not have a desk phone but instead want to use the embedded SIP softphone capability within the Communicator 2007 client.

PC-to-Phone SIP (Session Initiation Protocol) integration is supported between OCS 2007 and the 3300 ICP. An end user can establish calls from a Microsoft Office Communicator 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. The term PC-to-Phone encompasses calls between PC to PSTN, Phone to PC, and PSTN to PC.

This solution is typically used by mobile employees who do not have a desk phone but instead want to use the embedded SIP softphone capability within the Communicator 2007 client.

From a Microsoft Office Communicator client, a user 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 the Office Communications Server 2007.

There is no integration between the Communicator client and a Mitel desk phone; if this is required, then Live Business Gateway 3.1 and Remote Call Control should be used.

PC-to-Phone provides Communicator users with access to the full range of features provided by the Office Communications Server (for example, Audio and Video Conferencing, Web Collaboration, and Simultaneous Ringing).

PC-to-Phone is supported with OCS 2007 and 3300 ICP release 8.0 UR3.