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Routing Procedure 3: Routing Flow Chart (2)
Is there your PBX's extension
number in the received digits?
Yes
Does that extension actually
exist?
Yes
No
Is it idle?
Yes
Calling to the specified
extension.
Features Guide
Analysing digits sent from the
other PBX.
Does the leading 3-digit of the
No
received digits match your
PBX Code?
Is your PBX's CO access code
or extension number included
in the received digits?
Is there a CO access code of
No
your PBX in the received dig-
its?
Is "Trunk to Trunk
Restriction" of the selected
Trunk Group set to "Yes"?
No
Is it an extension number of
other PBX's?
No
Trunk Group for making an
outgoing TIE call is decided
by a Routing Table.
Sends busy
tone.
Is "Trunk to Trunk
Restriction" of the selected
Trunk Group set to "Yes"?
Yes
Yes
Yes
Yes
Sends reorder tone.
Yes
Yes
Sends reorder tone.
3.1 E&M Features
No
No
Calling to CO.
No
Sends reorder tone.
No
Sends digits
received from one
PBX to another.
351
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