1.
Yes
Does the dialed number begin with a
leading number (PBX code or first few digits of an
extension number) stored in the TIE Line Routing
and Modification Table?
Yes
Yes
Yes
A
Routes to other PBX or CO line.
Is there an idle CO line
in the trunk group?
No
Busy tone
The TIE Line Routing and Modification Table checks the number and
selects the highest-priority Trunk Group that is available.
The dialed number is modified if a removed number of digits
and/or added number is assigned.
No
Not treated as a call
which uses the TIE line.
Is the dialed number either
an extension number of another PBX or
a number beginning with the
TIE Line Access number?
Reorder tone
No
No
Reorder tone
Is a trunk group
available?
A TIE line call is made using one of the
following methods:
PBX Code Method:
TIE Line Access Number + PBX Code +
(Extension Number or Other Digits)
Extension Number Method:
Extension Number
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