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IP Telephony Configuration Guide
Chapter 3
Installing IP telephones
An IP telephone converts the voice signal into data packets and sends these packets directly to
another IP telephone or to the Business Communications Manager over the LAN or the internet. If
the destination is an IP telephone, the arriving voice packets are converted to a voice stream and
routed to the speaker or headset of the target telephone. If the destination is the Business
Communications Manager, the voice stream is routed to a circuit switched connection, such as a
telephone (internal) or line (external PSTN or private network), or some form of gateway (VoIP).
Before setting up IP clients, you must enable keycodes for IP telephony. For information on
entering keycodes, see the Keycode Installation Guide.
Supporting IP telephony
The Business Communications Manager supports two types of IP telephony protocols, UNISTIM
and H.323.
• The Nortel Networks i-series telephones use UNISTIM.
• The Symbol NetVision and NetVision Data telephones use H.323+. Refer to Chapter 4,
“Installing NetVision telephones,” on page 51.
The applications that control these protocols on the Business Communications Manager provide
an invisible interface between the IP telephones and the digital voice processing controls on the
Business Communications Manager.
About Nortel Networks IP telephones
The i2002 and i2004 telephones are hardwired to an internet connection. They can be installed on
any internet connection that has access to the network connected to the LAN or WAN of the
Business Communications Manager.
The Nortel Networks i2050 Software Phone runs on any computer running Windows 98 or
Windows 2000. The computer must be connected to the LAN or WAN that the Business
Communications Manager is connected to.
Note: IP telephones require an IP network to reach the Business Communications
Manager. However, they do not need to use VoIP trunks to communicate beyond the
Business Communications Manager. They can use any type of trunk in the same way that
digital telephones do.
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