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IP Telephony Configuration Guide
Chapter 5
Configuring local VoIP trunks
This section explains how to configure voice over IP (VoIP) trunks on a Business
Communications Manager system for incoming traffic. A VoIP trunk allows you to establish
communications between a Business Communications Manager and a remote system across an IP
network.
The Business Communications Manager supports two trunk protocols: H.323 (version 4) and SIP.
Since these protocols have different properties, they are configured through separate records, even
though many of the same settings are required. H.323 trunks support connections to other Business
Communications Managers, Meridian systems running IPT software, and trunk-based applications
such as NetMeeting. SIP trunks currently support trunk connections between Business
Communications Managers.
• H.323 trunks are programmed under Services, IP Telephony, IP Trunks, H.323 Trunks.
• SIP trunks are programmed under Services, IP Telephony, IP Trunks, SIP Trunks.
Each trunk is also associated with a line record, which are found under Services, Telephony
Services, Lines, VoIP lines.
Configuring a VoIP trunk requires the following actions:
• “Pre-installation system requirements” on page 82
• “Determining your IP trunk count” on page 83
• “Configuring media parameters” on page 85
• “Setting up the local gateway” on page 87
• “Viewing SIP summary and status” on page 92
• “Incoming calls: Assigning target lines” on page 92
More VoIP trunk configuration:
• “Setting up VoIP trunks for outgoing calls” on page 95 provides information about setting up
your VoIP trunks so your users can make calls to other systems.
• “Optional VoIP trunk configurations” on page 123 provides information about some
applications or features that are not required for all trunks, or which are optional to operation
of the trunks.
Note: If you are using the Business Communications Manager with a Meridian 1
(M1-IPT) system, you must set up the system to be compatible with the M1.
Refer to “Interoperability” on page 169. There is also an extra setting that may need to be
enabled or disabled to allow message waiting indication (MWI) if the M1 is the central
voice mail location. Refer to “Remote voice mail MWI over VoIP trunks” on page 135.
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