The PC that runs the OC 2007 must be registered to the domain in which the
OCS 2007 server runs. The OC 2007 client can be installed on a PC that
runs most versions of Microsoft Windows with the hardware device driver
API DirectX 9 or later. For more information on the OC client requirements,
see

Table 11 "Office Communicator client requirements" (page 54)

For more information about deploying the OC client, see Microsoft Office
Communicator 2007 Deployment Guide . Download Microsoft technical
documentation from the Download Center at

www.microsoft.com

Load Balancer capacity requirements

Capacity planning for OCS 2007 is measured in terms of the number
of clients. However, this becomes difficult to measure because of the
enhanced capabilities and services for a pool and the variety of components
that can be enabled in OCS 2007. Components can reside on separate
servers, which adds to the complexity of capacity planning. A single client
user can have multiple connection instances that depend on the features
enabled. Each feature has different bandwidth requirements that can differ
from one enterprise to another.

For more information on capacity guidelines, see

Table 5 "Maximum

supported users for each topology" (page 52)

For more information about capacity planning, see the Microsoft Office
Communications Server 2007 Planning Guide. Download Microsoft
technical documentation from the Download Center at

www.microsoft.com

SIP CTI (TR/87) services requirements

When you plan for capacity with Session Initiation Protocol Computer
Telephony Integration (SIP CTI) services, observe the following restriction:
For a single CS 1000 that supports multiple nodes, (each with SIP CTI
services enabled), you can establish multiple SIP CTI (TR/87) sessions for
a DN through the same node—but not through different nodes.

Nortel Communication Server 1000

Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007

NN43001-121

01.03

Standard

Release 5.0

30 April 2008