Microsoft said Monday it had entered into an agreement with Cisco Systems to integrate the Session Initiation Protocol (SIP)-based Microsoft Live Communications Server with the SIP-based Cisco Unified Communications System. The two companies say the partnership would enhance real-time business communications.

Cisco and Microsoft will work together to create a converged solution that would be able to interface with Cisco's Unified CallManager, allowing for desktop VoIP call control.

Barry O'Sullivan, Cisco vice present of the IP Communications Business Unit, said this was a common request among their customers. Microsoft added that the two companies share common users, so interoperability made good business sense.

"The interoperability of Live Communications Server and Office Communicator with Cisco's communication offerings will lead to more effective real-time collaboration capabilities for our mutual customers," said Microsoft general manager for Unified Communications Zig Serafin.

The solution to be provided by Cisco and Microsoft would allow for click-to-call and transfer of calls from the Redmond company's Office Communicator product without the need for human interaction. Customers would also be able to choose whether to take calls from a computer or desk phone.

Other advantages include the ability to view Cisco VoIP phone presence within Office Communicator, and transparent escalation of instant messaging and voice sessions, the companies said.

Microsoft says the initial phase of the partnership would yield the first interoperabililty solutions in August of this year.