NEC Electra Elite 48/192 Features And Specifications Manual page 505

Issue 6
R - 20
Use Memory Blocks 1-1-46 and 1-1-47 [Access Code (1- or 2-Digit)
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Assignment] Function Nos. 201~216 to define Route Advance Block
Access Codes.
Up to four Trunk groups can be programmed in one Route Advance
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Block priority table.
Trunk groups can be repeated in multiple priority tables.
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Restrictions:
The system must be assigned as MF registration.
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General:
Outgoing Restriction and Code Restriction rules apply to stations
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dialing out using Route Advance Blocks.
The line key assigned for a Route Advance Block is off when all
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trunks and Trunk groups assigned to the Route Advance Block are
busy.
Stations are allowed to set Trunk Queuing to a Route Advance Block.
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Electra Elite
Route Advance Block