Nortel Networks NN43001-121 Call Server requirements, OCS Proxy and MCM capacity requirements

50Planning and engineering

For example, MCM works as a software load balancer in addition to a router. MCM uses a round-robin algorithm for load balancing. When the current Mediation Server does not answer, MCM jumps to the next Mediation Server. You can use load balancing for direct mode and with SPS or SRS.

For Release 5.0, 1 GB of memory is required for a standard Signaling Server. All signaling servers must run the latest software version. For information on geographic redundancy, see "Geographic redundancy" (page 78).

Call Server requirements

The CS 1000 must run Release 5.0 with the Product Enhancement Package or later.

For different CPUs, the number of supported users are:

•CP PII: 7000 users

•CP PIV: 13 000 users

•CP PM: 13 000 users

OCS Proxy and MCM capacity requirements

The MCM is required to reside on a separate OCS Proxy server and the capacity of the OCS Proxy server with MCM depends on the hardware platform and the usage. For example, VoIP calls only, SIP CTI calls only or a combination of both. Because capacity characterization cannot be conducted on all server platforms, Nortel recommends using standardized sets of relevant benchmarks available from the Standard Performance Evaluation Corporation (SPEC). SPEC is a non-profit corporation formed to establish, maintain, and endorse benchmarks that can be applied to the newest generation of high-performance computers. A compressive list of benchmarks is available at www.spec.org.

The server used for capacity characterization had a SPECint_rate2000 value of 18.6. See Table 4 "Maximum call rate" (page 50) for the maximum call rate of this server for the three different configurations.

Table 4

Maximum call rate

Usage	Maximum call rate
VoIP calls	15	000
SIP CTI (TR/87) calls	10	000
Combined	12	500*

* Depends on the ratio of either call scenarios assumed 50% of each. For example: Worst case–all SIP CTI calls, Best case–all VoIP calls.

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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