NEC SL1100 - Page 746

EXAMPLE:
The following example indicates how a call is handled with the system programmed as follows:
• PRG 14-01-25: 1 (Continued/Discontinued Trunk-to-Trunk Conversation)
• PRG 20-28-01: # (Conversation Continue Code)
• PRG 20-28-02: No Setting (No Conversation Disconnect Code is entered)
• PRG 20-28-03: 180 (Conversation Continue Time)
• PRG 24-02-07: 600 (Only used with Trunk-to-Trunk Transfer Release Warning Tone)
• PRG 24-02-10: 30 (Only used with Disconnect Trunk-to-Trunk)
• PRG 25-07-07: 600 (Long Conversation Warning Tone Timer)
• PRG 25-07-08: 30 (Long Conversation Disconnect)
1. An external call connects to an external number (either by transferring with Tandem Trunking or
by DISA caller).
2. After 10 minutes (Tandem Trunking = PRG 24-02-07 or DISA = PRG 25-07-07), a warning tone
is heard and the user dials # (PRG 20-28-01) to extend the conversation.
3. After three minutes (PRG 20-28-03), the warning tone is heard again. After 30 seconds
(Tandem Trunking = PRG 24-02-10 or DISA = PRG 25-07-08), the call is disconnected.
Conditions
• Tandem Trunking requires loop start trunks with disconnect supervision.
• The maximum number of simultaneous trunk-to-trunk conferences allowed is determined by the
Conference feature setup. Refer to the Programming section for this feature.
• The Continue/Disconnect code must be DTMF.
• With an analog trunk, the Continue/Disconnect code may work using DTMF sounds from the
opposite side trunk. With an ISDN trunk, PRG 14-01-25 must be enabled to detect the Continue/
Disconnect code.
• The Continue/Disconnect code is not accepted while dialing a trunk.
• Continue/Disconnect codes do not work if all receivers are busy.
• A trunk can be set up to automatically tandem trunk/forward to an outside telephone number or
Speed Dial - System/Group Dialing bin.
• Other programmed options for incoming and outgoing calls can affect how calls are handled. Refer
to Central Office Calls, Answering/Central Office Calls, Placing and check or program these options
as needed.
• DISA calls also use the same Continue/Disconnect codes.
• After initiating an unsupervised conference, selecting one of the line keys allows you to barge-in to
the conference.
• If the station that barges into an unsupervised conference hangs up, the conference is terminated.
• A Trunk-to-Trunk transfer can be established by the following operation:
1. While talking to an outside party, press Hold key.
2. Access a second outside line and dial the desired number.
3. Press Transfer key to complete the Trunk-to-Trunk transfer.
When the second call is to be transferred to another station (Not Trunk-to-Trunk), the user should
press Hold key at step 3, then dial the desired station, and press Transfer key to complete the
transfer.
Default Settings
Disabled
SL1100
ISSUE 2.0
1-734
Tandem Trunking (Unsupervised Conference)
T