Nortel Networks NN43001-121 manual Feature Interactions, SIP routing

68Planning and engineering

Figure 22

SIP routing

Calls made to a CS 1000 that is different from the twinned telephone base uses two SIP trunks: one incoming and one outgoing.

Additional SIP trunks are needed, if users commonly call between CS 1000 systems.

For more information about the number of required SIP trunks, see the calculations described in "Trunking" (page 55) and the platform-specific Planning and Engineering document.

Feature Interactions

This section describes the interactions of the Telephony Gateway (VoIP) component.

Call transfers for Office Communicator direct PC-to-PC call If an Office Communicator user sets up a call in Computer mode to another Office Communicator user directly, the call is sent to a Computer instead of a telephone number as depicted in Figure 23 "Computer call" (page 69). As a result, the CS 1000 is not involved in the call and cannot transfer it to a telephone number.

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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