Nortel Networks NN43001-121 manual Capacity, Redundancy, SIP routing

		Telephony Gateway and Services planning 67
System, platform, or application			Supported
M1/CS 1000 Systems
CS 1000M	SG (CP PIV)		Yes
CS 1000M	MG (CP3/4)		Yes
CS 1000M	MG (CP PIV)		Yes
CS 1000E			Yes
MG 1000B			Yes

Capacity

For more information relating to the Telephony Gateway and Services and Remote Call Control components, see "Capacity planning" (page 46).

Redundancy

Office Communications Server 2007 redundancy model is supported, with limitations, using Load Balancers.

NRS redundancy NRS redundancy is similar to Converged Office redundancy; a heartbeat mechanism between MCM 3.0 and NRS servers is implemented. When a heartbeat failure from the primary NRS server is detected, all messages are redirected to the secondary NRS server.

SIP routing

MCM directs calls from an Office Communicator user to the CS 1000 connected to their twinned telephone. A user can have a telephone number in Active Directory associated with their account as depicted in Figure 22 "SIP Routing" (page 68), the number is 231-3052. Calls made from a user to any endpoint (Public or Private) are directed to their CS 1000. The CS 1000 tandems the call to the other CS 1000 (if necessary).

SIP routing ensures the following:

•Outgoing Office Communicator calls made by a twinned client can be tracked by Call Detail Recordings (CDR).

•Calls from an Office Communicator to incompatible systems can be made.

In Figure 22 "SIP Routing" (page 68) the user david@ocsserver.com calls 6-441-5431 (AC1-LOC-DN). The From header in the INVITE has David’s Line URI in the format of E.164;ext=2313051. The MCM gets the extension number 2313051 and uses the NRS to find the CS 1000 associated with the number 231-3052 and directs the call. This CS 1000 directs the call to the CS 1000 that has the destination number of 441-5431, which then directs the call to the appropriate end user device.

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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