NEC Electra Elite 48/192 Features And Specifications Manual page 312

Electra Elite
RELATED FEATURES
LIST
Features and Specifications Manual
General:
Each TLI(2)-U10 ETU supports two 4-wire E&M Tie Lines.
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When a call from/to the remote end is made to a busy station in the
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Electra Elite systems, the caller cannot set Callback Request, Step
Call, or Camp-On.
The incoming ringing pattern for Tie line calls can be changed in
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System Programming, or voice announcement can be selected
system-wide (default: 2 seconds ON/4 seconds OFF).
Immediate start, wink start, delay start, or second dial tone (default)
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loop supervision can be selected per trunk using System
Programming.
When voice announcement for incoming Tie calls is selected, the
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outside party cannot switch the call to a ringing call.
The Recall key and Drop key are ignored when Tie lines are used.
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Feature
Number
F-4
T-2
T-7
U-3
Feature Name
Flexible Numbering Plan
Tandem Switching of 4-Wir eE& MTi eLines
Trunk-to-Trunk Transfer
Uniform Numbering Network
Issue 6
E - 9