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Office Communications Server: SIP Trunking

In the Office Communications Group (OCG) white paper “Integrating Telephony with Office Communications Server 2007” stated that “SIP Trunking” was out of scope for that release but was “under consideration” for future releases.  We are always reluctant to commit features to releases in advance of the official release announcement; however it is reasonable to say that the process of consideration is underway.

OCS 2007 Voice Connectivity: In Office Communications Server 2007 (OCS) there are 3 modes of voice calling:

1. OCS point to point: User A calls User B – call is VoIP end to end.

· The endpoint could be Office Communicator (OC) or an IP phone (e.g. Polycom CX700)
· Users could be either inside the network or roaming
· Applies equally to multi-modal communications (i.e. IM, Video, Collaboration)

 2.OCS Federation-a User in domain A calls a User in domain B –   the call is  VoIP end to end over the public internet.

· Federated calls still carry the same capabilities as point to point  calls described above – roaming, video, etc.

3. PSTN to OC: a telephony user (PSTN, mobile, PBX) calls an OC user (or vice versa).

· OCS Co-existence – PBX phone and OC are integrated via “dual-forking” mechanism between PBX and OCS, such as Nortel’s Converged Office

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