Nortel Networks NN43001-121 manual SIP Routing and Redundancy configuration

198Configuration

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

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