Nortel Networks NN43001-121 - Manual (Page 198)

198 Configuration
SIP Routing and Redundancy configuration
Office Communicator is a soft phone application as well as a SIP User
Agent (UA). Office Communications Server Front End server (Standard
Edition Server or Enterprise Edition Server) hosts Office Communicator .
The TR/87 FE within the Communication Server 1000 is also a SIP UA.
Office Communicator 2007 establishes a SIP dialog in one direction only:
from the application to the TR/87 FE. The Office Communications Server
Front End, which functions as a SIP Proxy, is a required component. The
Nortel Multimedia Convergence Manager (MCM) is also required to provide
support for authorization and the use of an NRS.
ATTENTION
Due to the inability of the Office Communicator client to support the SIP 302
redirect message (a fundamental requirement for the basic operation of the NRS),
the MCM application installed on the Office Communications Server to support
Telephony Gateway and Services functionality is also a required component
for Remote Call Control support when using Office Communicator. The MCM
application handles the 302 redirect message on behalf of Office Communicator
clients.
Configuring Remote Call Control SIP Routing Using Phone Addressing
When an NRS is used with SIP addressing, based on the phone address
format, the Communication Server 1000 TR/87 FE used to support a
Remote Call Control session for a user must be co-resident with the SIP
GW. This is essential, as the URI that is present in the INVITE to establish a
TR/87 session is identical to the URI used to place a SIP call to the user.
Thus, the NRS redirects the INVITE based on the request URI only (and not
the mime content type within the INVITE).
The TR/87 FE recognizes the TR/87 mime type within an INVITE and
intercepts the TR/87 INVITE if it is co-resident with the SIP Gateway. This
ensures that both TR/87 sessions and phone calls with the same request
URI are handled appropriately — either by the TR/87 FE or SIP Gateway,
on the same Signaling Server.
Redundancy configuration
For information about Redundancy, see "Redundancy" (page 78) .
OCS 2007 users using UM 2007 in integrated mode
Option 1 adding user Alias as Exchange UM
These procedures assume the installation procedures for Exchange UM
have already been completed. Download Microsoft documentation from the
Download Center at
www.microsoft.com .
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
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