NEC Univerge SV8100 Features And Specifications Manual page 1606

Issue 12.0
Tandem Ringing is not supported with extensions defined as Operator Extensions in

Program 20-17-01.
Default Setting
Disabled
System Availability
Terminals
Master Telephone:
TDM Multiline Terminals or Single Line Telephones
Slave Telephone:
Single Line Telephones
Required Component(s)
None
Related Features
Call Forwarding
Call Forwarding/Do Not Disturb Override
Direct Station Selection (DSS) Console
Do Not Disturb
Hold
Intercom
Message Waiting
Ring Groups
Multiple Trunk Types
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UNIVERGE SV8100
Tandem Ringing