Nortel Networks NN43001-121 manual Migration planning from LCS 2005 to OCS, MCM 2.0 to MCM

84Planning and engineering

MCM 2.0 to MCM 3.0

There is no direct upgrade path from MCM 1.0 or 2.0 to MCM 3.0 . MCM

3.0must be installed on the OCS Proxy server. The OCS Proxy install is done from command line and not from the install wizard. It is still possible to preserve the configuration data from a previous installation by first performing a backup operation on MCM 2.0 and restore the data to MCM

3.0on the OCS Proxy server. However, this will cause the new configuration parameters to be set to default values as follows:

Table 18

Default configuration parameters

Parameter	Default value
Call Server	CS1000
MediationServer	enabled
RoutingTable	empty
DialPlan	CDP
AccessCode	empty

For more information on MCM 3.0 configuration, see "MCM configuration" (page 134)

Load balancer considerations

You cannot use a single logical load balancer for LCS 2005 and OCS 2007. For example, if you have an LCS 2005 application proxy with MCM 2.0 attached to a logical load balancer, you cannot simultaneously attach an OCS Proxy server with MCM 3.0 to the same one. This same restriction applies to all other server roles.

Migration planning from LCS 2005 to OCS 2007

Live Communications Server 2005 with SP1 can only be upgraded to Office Communications Server 2007 by using a side-by-side migration. This involves deploying an Office Communications Server 2007 Standard Edition or Enterprise pool alongside existing Live Communications Server 2005 with SP1 Standard Edition or Enterprise pool thus allowing the two environments to coexist with minimal service disruption.

When migrating servers, Office Communications Server 2007 servers should be deployed using a phased, outside-in approach. This involves replacing the Access Proxies with Office Communications Server 2007 Access Edge Servers before you migrate to Office Communications Server 2007 in your internal environment. Upgrading all the servers of a particular type at one time will help to minimize service disruptions.

The following flow chart depicts the migration phases:

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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