Avaya Site Administration Reference Release 3.1 Manual de usuario Pagina 78

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Avaya Site Administration Reference
68
Trunks
Understanding trunks
Trunks are communication lines that carry voice or data transmissions between two
communications systems or central offices. There are a variety of trunk types, each with
different capabilities.
Trunks can be characterized by:
Signal type (analog or digital)
Transmission media or wiring type (copper or fiber optic)
Direction (one-way in, one-way out, or two-way)
Connection type:
Central Office to voice system (Public Access Trunks)
Switch to voice system (Tie Trunks)
Switch to long distance provider (Public Access Trunks)
Preparing to add a trunk
When installing a new trunk, provide the vendor with the following information:
The type of trunk you want to install (for a table with a list of trunk types see the Trunk
Classification Table.)
For a Central Office (CO) trunk, provide the following information:
Quantity (number of trunks)
Trunk direction (1-way in, 1-way out, two-way)
Signaling method (ground start or loop)
Tip
Given a choice, always use ground start trunks. Ground start trunks send a
signal to the Central Office that clears the line before you make a call. This
prevents outside calls from coming in on the trunk you are using to dial out, also
known as glaring.
For a Direct Inward Dial (DID) trunk, provide the following information:
The extension number range that is currently established on the dial plan.
Advise your vendor which extension ranges you want to be called via the DID
service.
Quantity (number of trunks)
Signaling method (DID, wink, or immediate - we recommend wink)
For a tie trunk, provide the following information:
Quantity (number of trunks or channels)
Trunk direction (2-way, 1-way in, or 1-way out)
Signaling method (wink, immediate, delay dial, or auto)
Note
Regardless of what type of signaling method is assigned, the voice
system and network vendor must match.
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