Microsoft introduced the public beta of its Office Communications Server 2007 at VoiceCon. Following the announcement, Gurdeep Singh Pall, corporate vice president of Microsoft's Unified Communications Group, discussed with Network World Senior Editor Phil Hochmuth how Microsoft's Session Initiation Protocol-based VoIP, messaging and collaboration server fits in and competes in the corporate convergence market.The following is an edited transcript.

How are you presenting Office Communications Server 2007 to enterprise voice managers and IT managers?

The key message is to see what it can do for you and see what limitations they may have. We see a lot of folks going down these one-way streets [with PBX and IP telephony vendors]. They might find themselves in a situation where they've deployed a solution, and because it is not an open solution, it is slow in terms of innovation.

Are you talking IP PBX products from companies such as Avaya, Cisco, Nortel and so forth?

Yes. These are closed systems. They're just like mainframes. Once you bought the computer, or IP PBX in this case, pretty much every component you buy from that vendor. They'll tell you about openness, and say "you can buy any SIP phone, sure," but when you call product support, they'll tell you, "sorry, if you're not using their phone, we can't guarantee the voice experience." It sort of builds on the fear that voice cannot be delivered in an open platform.

Our approach to building a solution was we didn’t try to look at it one way. We didn't go back and say here is a list of 300 features on a PBX, and that we need to start matching each one of them. We looked at what people want from their communications systems. For example, IP PBXs today have all these features, but if you ask a user to do anything more than answer a call, or add a third person into a call, it's very hard. Most users have unmet needs today.

Many IP PBX vendors at VoiceCon are calling Microsoft a partner. Is OCS a complementary product or a competitive product for these companies?

Enterprises which have a TDM PBX today are looking to move to an IP solution. Then you have some enterprises which have some TDM PBXs and some IP PBX and their goal is to replace all of their TDM PBXs with IP PBXs. What we are telling both groups of users is that we believe, over time, you can be totally based on Office Communications Server. For now, we also want to help customers deal with missing features they may not have, or to help along those who are saying, 'oh, can I trust my voice entirely to Microsoft.' They can keep their current system in place, and put Office Communicator next to it, and slowly phase out the old one.