
Chapter 1 Introduction 21
IP Telephony Configuration Guide
Creating the IP telephony network
This section explains the components of the Business Communications Manager 3.0 system and
the devices it interoperates to create a network.
This section includes information about:
• “Business Communications Manager 3.0” on page 22
• “M1-ITG” on page 23
• “Telephones” on page 23
• “Gatekeepers on the network” on page 24
• “IP network” on page 24
• “Public Switched Telephone Network” on page 25
The following figure shows components of a Business Communications Manager 3.0 network
configuration.
Note that the two Business Communications Manager systems are connected both through a PSTN
connection and through a WAN connection. The WAN connection uses VoIP trunks. If the PSTN
connections use dedicated ISDN lines, the two systems have backup private networks to each
other. Both Business Communications Manager systems use VoIP trunks through a common
WAN to connect to the Meridian (M1-ITG) system.
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