Nortel Networks NN43001-121 manual OCS 2007 Voice components

18Converged Office component overview

•the Mediation Server performs all necessary media transcoding and routes the call to the IP-PSTN gateway.

•the IP-PSTN gateway, based on topology, applies local or PBX dialing rules and passes the call to the PSTN or PBX

Enterprise Voice uses Real-Time Transport Protocol (RTP) for media. Like SIP, RTP is an Internet Engineering Task Force (IETF) standard. It defines a packet format to carry audio and video over IP networks.

Enterprise Voice uses SIP for signaling and RTP for media. In the OCS, SIP is used for IM, conferencing, presence subscriptions, video, and voice enabling Enterprise Voice clients to provide a common user experience across the communication modes.

Enterprise Voice is the Microsoft SIP–based implementation of IP telephony for the Enterprise.

SIP sessions can include the sharing of real-time media. However, SIP itself does not handle the actual media data, such as audio, video, and application sharing. This separation means that SIP and various media protocols can evolve independently.

OCS 2007 Voice components

The core routing components for Enterprise Voice reside on the following:

•Standard Edition Server (in the role of Front End Server or Director)

•Enterprise Edition Front End Server

Other core routing server components include

•Translation Service—translates a dialed number into E.164 format based on the normalization rules defined by the administrator.

•Inbound Router—handles incoming calls according to user-specified preferences.

•Outbound Router—routes calls to CS 1000 or PSTN destinations after it applies authorization rules to callers and determines the optimal media gateway to route each call.

OCS 2007 Front End or Director components essential for voice support, but are not voice components include

•User Services—performs Reverse Number Look-up on the target phone number for incoming phone calls.

•User Replicator—extracts user phone numbers from the Active Directory for use by User Services and the Address Book Service.

Nortel Communication Server 1000

Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007

NN43001-121 01.03 Standard

Release 5.0 30 April 2008

Copyright © 2005–2008, Nortel Networks