
18 Chapter 1 Introduction
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IP telephones and VoIP trunks
This guide describes two similar applications for IP telephony on the Business Communications
Manager 2.5 system: IP telephones and VoIP trunks. These applications can be used separately or
together as a network voice/data solution.
IP telephones
IP telephones offer the functionality of regular telephones, but do not require a hardwire
connection to the Business Communications Manager. Instead, they must be plugged into an IP
network which is connected to the LAN or WAN card on the Business Communications Manager
2.5.
Calls made from IP telephones through the Business Communications Manager can pass over
VoIP trunks or across a Public Switched Telephone Network (PSTN).
Nortel Networks provides two types of IP telephones. The i-series telephones are hardwired to the
system, in the case of the i2002 and the i2004, or are accessed through your desktop or lap top
computer, as in the case of the Nortel Networks i2050 Software Phone. Emobility voice can be
provided using Symbol* NetVision* or NetVision Data telephones, connecting through an access
point wired to an internet connection configured to the LAN or a WAN on your Business
Communications Manager. NetVision telephones use the H.323 protocol to connect to the system.
VoIP trunks
VoIP trunks allow voice signals to travel across IP networks. A gateway within the Business
Communications Manager 2.5 converts the voice signal into IP packets, which are then transmitted
through the IP network. The device at the other end reassembles the packets into a voice signal.
NetMeeting is one of the H.323 protocol trunk devices that the 2.5 Business Communications
Manager system supports.
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