Nortel Networks NN43001-121 manual LCS 2005 and OCS 2007 coexistence

LCS 2005 and OCS 2007 coexistence 83

supported configuration because of incompatible underlying libraries. The same CS 1000 can be connected to two or more different communication servers (LCS 2005 or OCS 2007).

The following must be considered for coexistence of LCS 2005 and OCS 2007:

•The CS 1000 must be upgraded to Release 5.0 with the required Product Enhancement Packages (PEPs) .

•OCS 2007 patches from Microsoft must be in service. For more information, see the Attention box under "OCS 2007 component installation" (page 105).

•NRS is required to appropriately route a call to the Communication Server.

•Different server DNs (Hot Ps) are assigned for each Communications Server (LCS or OCS). The PCA for each user is configured with the corresponding server DN as a target DN

•LCS 2005 and OCS 2007 can share the same Active Directory but you can only have one OC client user account on either LCS 2005 or OCS 2007.

•For Remote Call Control (RCC) support , a single Signaling Server cannot be used for both LCS 2005 and OCS 2007 as the configuration of the SIP CTI FE is different for both. In this case, the following options can be considered:

—RCC supported for both LCS 2005 and OCS 2007. Upgrade the existing Communication Server 1000 to support OCS 2007 RCC users. Configure an additional SIP CTI FE Signaling Server for LCS 2005 RCC users. An additional AML ELANs is defined on the Call Server. Change the static routing rule on the LCS 2005 Home server to route RCC traffic directly to the SIP CTI FE for LCS 2005. Geographic Redundancy is not supported for LCS 2005 RCC users in this case.

—RCC supported for only LCS 2005 users. Enable RCC only for LCS users in the Active Directory, on the OC clients, or both. The SIP CTI FE should be configured according to the document Nortel Converged Office Fundamentals (NN43001-525) for LCS 2005. For example, the Phone context=dialstring configuration on the Signaling Server is used.

—RCC supported only for OCS 2007 users. Enable RCC only for OCS users in the Active Directory, on the OC clients, or both. The SIP CTI FE should be configured according to this document. For example, the Phone-context=<SIP URI Map Entries> configuration on the Signaling Server is used.

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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