Nortel 1000 Fundamentals page 26

26 Converged Office component overview
Gateway and Services to always tandem through the user's active Call
Server. Note that with Geographic Redundancy features, a user's active
Call Server may change during failure scenarios.
The Network Class of Service (NCOS) setting for outgoing calls from Office
Communicator clients is determined by the configuration of the MARP TN
when in a MADN group, or by the configuration of the PCA when it is the
only TN for the user.
With PCA and Remote Call Control configured, users receive one pop-up
window for the incoming call to the phone or computer. Users can choose
the most convenient way to answer an incoming call.
Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007
Copyright © 2005–2008, Nortel Networks
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Personal Call Assistant (PCA) service
While at the office, a user may decide to use a desktop phone to answer
calls. However, the user can still accept calls through the OC 2007 while
they travel to locations that have network connectivity (for example,
at hotels).
The following steps correspond to the numbers in the figure:
1. The CS 1000 system receives a PSTN call to the user's phone
number.
2. The CS 1000 uses the PCA feature to provide simultaneous ringing
to both the user's phone and the Office Communicator voice client.
3. The user can answer the call through the CS 1000 phone or the
Office Communicator voice client.
Users can be reached anywhere on the network and significant cost
savings are incurred by using IP telephony through Virtual Private
Network (VPN) access to their private network.
As part of the telephony services, many incoming call features are
available even when using the OC 2007 as a telephony device or more
Nortel Communication Server 1000
NN43001-121 01.03 Standard
Release 5.0 30 April 2008