Avaya Communication Manager Administrator's Manual page 1607

Valid entries Usage
DMI-BOS Digital Multiplexed Interface - Bit-Oriented Signaling (DMI-BOS) trunks
allow communication with systems using DMI-BOS protocol. DMI-BOS
trunks allow inband ANI.
FX An FX trunk is essentially a CO trunk that connects your server running
Communication Manager directly to a central office outside your local
exchange area. Use FX trunks to reduce long distance charges if your
organization averages a high volume of long-distance calls to a specific
area code.
ISDN Use ISDN trunks when you need digital trunks that can integrate voice,
data, and video signals and provide the bandwidth needed for
applications such as high-speed data transfer and video conferencing.
ISDN trunks can also efficiently combine multiple services on one trunk
group.
Use ISDN for Network Call Transfer.
Note: You cannot enter ISDN unless the ISDN-PRI field, the ISDN-BRI
Trunks field, or both have been enabled on the System-Parameters
Customer-Options screen.
RLT Release Link trunks work with Centralized Attendant Service in a private
network.
SIP Use SIP trunks to connect a server running Communication Manager to a
SIP Enablement Services (SES) service provider's server or switch.
Tandem Tandem trunks connect tandem nodes in a private network. Tandem
trunks allow inband ANI.
Tie Use tie trunks to connect a server running Communication Manager to a
central office or to another server or switch in a private network. Tie trunks
transmit dialed digits with both outgoing and incoming calls, and allow
inband ANI.
WATS Use WATS trunks to reduce long-distance bills when your organization
regularly places many calls to a specific geographical area in North
America. Outgoing WATS service allows calls to certain areas ("WATS
bands") for a flat monthly charge. Incoming WATS trunks allow you to
offer toll-free calling to customers and employees.
Trunk Group
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Issue 2.1 May 2006 1607