Nortel Networks NN43001-121 manual Dialing Plan configuration to route to MCM

Telephony Gateway and Services configuration 153

ATTENTION

When any kind of in-band signaling is to be used as payload audio packets (for example, DTMF tones) in the egress direction (IP to TDM), the Signal Limiter functionality must be disabled. If problems are encountered with DTMF tones from Office Communicator contact Nortel support to ensure the Signal Limiter functionality is disabled.

Dialing Plan configuration to route to MCM

In order for calls to be extended using PCA to the Office Communications Server, a dialing plan entry must be entered on the Call Server to send the call to the SIP trunk. This dialing plan entry does not correspond with any number that is dialable within a network, but rather is used to route the call to the MCM. The MCM service running on the OCS Proxy server handles the incoming call and directs the call to the correct Office Communicator client.

The reason for this is that the SIP Invite generated by PCA has two fields:

•To: this field is used for the sole purpose of routing the invite to MCM.

•Original Called Number (OCN): this field is used to determine the original number called. The OCN maps to stored information on the Active Directory and sends the call to the correct Office Communicator client.

For example, the CS 1000 network can be configured as shown in Figure 53 "Dialing plan to route to MCM" (page 153).

Figure 53

Dialing plan to route to MCM

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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