NEC Electra Elite 48/192 Features And Specifications Manual page 237

Issue 6
D - 28
When a DID incoming call is not answered before a time specified in
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Memory Block 1-1-07 (Tie Line Delay Ringing Time Selection)
∞
, no timeout), the call can switch to normal Day or Night
(default:
ringing assignment.
Use Memory Block 1-1-55 (DID Line Ringing Pattern Selection) to
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change the ringing pattern (default: A) for an incoming DID call.
Use Memory Block 2-09 (DID Limit to Tenant Assignment) to specify
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the number of calls allowed to ring at a specified Tenant (System
Software S5000 or higher is required).
Use memory Block 3-14 (Tie Line Type Assignment) to assign loop
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supervision for each trunk associated with a Tie line to 2ND DIAL
(default), IMMEDIATE, DELAY, or WINK.
Use Memory Block 7-1 (Card Interface Slot Assignment) to specify
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the DID(4)-U10 ETU.
Restrictions:
Automated Attendant requires System Software S5000 or
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higher to support DIDs. Refer to the Automated Attendant feature.
Using system software S5000 only, Memory Block 1-4-02
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(Automated Attendant Transfer Delayed Ringing Time Selection)
must time out before incoming DID calls can be answered by the
Automated Attendant (cannot be set to No Limit).
Using system software S5500 or higher, Memory Block 1-4-02
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(Automated Attendant Transfer Delayed Ringing Time Selection) is
not required to time out before incoming DID calls can be answered
by the Automated Attendant (can be set to No Limit).
A DID call does not activate External Tone Ringer or Night Chime.
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When an incoming DID call changes to normal ringing, the call is still
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counted toward the number of effective calls to the Tenant.
When the number of DID incoming calls is over the limit, and DID
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Forward Station Number for Busy Station or Undefined Digit is
active, forwarding is not activated, and the outside party receives a
Burst Tone.
General:
When the number of DID incoming calls is not over the limit, and DID
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Forward Station Number for Busy Station or Undefined Digit is
active, forwarding is activated.
Electra Elite
Direct Inward Dialing (DID)