Nortel Networks NN43001-121 - Manual (Page 68)

68 Planning 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
Copyright © 2005–2008, Nortel Networks
.