Visitor Intercom - Remote call setup and Listen-In
From Zenitel Wiki
This article describes how the ICX-AlphaCom system can be configured to control call setup between pairs of stations, e.g. used for visitor intercoms i prison, interrogation rooms etc. Up to 20 pairs of intercoms are supported.
From the Control Room Station one can:
- Set up and tear down calls between two stations in a "pair"
- Silently Listen-In on an active conversation
- Start/stop recording of active calls. This requires that a Zenitel Audio Recorder is installed.
Contents
Operation
The application is based on using the IP Flush Master with a DAK-48 module. One DAK panel supports up to 16 pairs of intercoms. If more pairs are needed (max. 20 pairs), a second DAK-48 panel must be added. Function keys on the DAK48 panel will be as follows:
- Call setup: Press the "Pair x" button. The two intercoms in the pair will be connected, and the green LED will be lit. Press the button again to terminate the connection. One can activate as many pairs as one wants.
- Listen-In: Press the "Listen x" button to silently monitor the conversation in the selected pair. Press the same button again (or C-button) to stop Listen-In. Only one conversation can be monitored at a time. If pressing a new "Listen x" button, the current monitoring will be terminated, and the new selection will be activated. Active Listen-In is indicated by green LED. One can start the "Listen-In" before or after a call has been set up. Talkback into the conversation is possible by pressing the M-key while talking.
- Audio Recording: Press the "REC x" button to start audio recording of the conversation in the selected pair. Recording can be started only after the call has been set up. An active recording is indicated by red LED. Multiple conversations can be recorded at the same time.
Number plan
The application is using the Duplex Conference feature of the ICX-AlphaCom. There are 20 conference channels, default numbers are 8301-8320.
General rules
A strict number plan must be followed.
- Each intercom pair is using one fixed duplex conference.
- The "Call setup", "Listen-In" and "Record" are Event Triggers, feature 52.
The general number rule is as follows:
- Intercom pair xx:
- Conference number: 83xx
- Station A: 41xx
- Station B: 42xx
- Call Setup: 43xx
- Listen-In: 44xx
- Record: 45xx
Example - Pair 4:
- Conference number: 8304
- Station A: 4104
- Station B: 4204
- Call Setup: 4304
- Listen-In: 4404
- Record: 4504
Station directory numbers
The Control Room Station must have directory number 4000.
The stations in the pairs must have directory numbers 41xx (Station A) and 42xx (Station B) according to the rules above.
Event Trigger directory numbers
Event Trigger numbers must be created in AlphaPro, Directory & Features menu as Event Trigger, feature 52.
Note that the ID field is used to separate the events. The ID field is linked to the Sub-Event filed in the Event Handler.
- Call Setup: 43xx. ID field = 1.
- Listen-In: 44xx. ID field = 2.
- Record: 45xx. ID field = 3.
DAK-48 panel configuration
If more that 20 DAK keys are used, one have to "borrow" DAK tables from free users.
Note that the Event Trigger numbers must be entered with the letter "E" in front:
Below shows which numbers should be assigned to the first 24 DAK keys on the panel:
Event Handler configuration
Call Setup event
IF %udd(%2.dir(2)) $ODC L41%2.dir(2,0) L8300 IND %1.phy %1.dak(E%2.dir) 2 1 OFF stop ENDIF $ODC L41%2.dir(2,0) L83%2.dir(2,0) IND %1.phy %1.dak(E%2.dir) 2 1 ON
$ODC L42%1.dir(2,0) L%chg(%2.dir,8300) WUDD %1.dir(2) %chg(1,0) IF %chg(0,1) IF %udd(1%2.dir(2,0)) $REC L%2.dir U0 WUDD 1%2.dir(2,0) 0 OWN 4000 IND %1.phy %1.dak(E45%2.dir(2,0)) 1 3 OFF ENDIF ENDIF
Listen-In event
IF %op(%2.dir,=,%udd(5000)) $DISCON_ST L%1.dir U0 WUDD 5000 0 stop ENDIF $SNV Q0 W1 W6 W54 $DISCON_ST L%1.dir U0 pause $ODC L%1.dir L83%2.dir(2,0) WUDD 5000 %2.dir pause pause pause $SNV Q4 W1 W6 W54
IND %1.phy %1.dak(E44%2.dir(2,0)) 2 1 WUDD 5000 %chg(44%2.dir(2,0),0) IF %chg(1,0) $DIP L%1.dir "auo 8" ENDIF
Audio Recording event
IF %udd(1%2.dir(2,0)) $REC L83%2.dir(2,0) U0 IND %1.phy %1.dak(E45%2.dir(2,0)) 1 3 OFF WUDD 1%2.dir(2,0) 0 stop ENDIF IF %udd(%2.dir(2,0)) $REC L83%2.dir(2,0) U1 IND %1.phy %1.dak(E45%2.dir(2,0)) 1 3 ON WUDD 1%2.dir(2,0) 1 stop ENDIF pause $DTS L%1.dir 'Rec. not avail.' U1 $DTS L%1.dir 'Call not active' U2
Reset UDD variables at ICX System startup
WUDD 5000 0 tmp 0 "0" LOOP tmp 0 "%op(%tmp(0),+,1)" WUDD %tmp(0) 0 IF %op(%tmp(0),=,20) BREAK ENDIF ENDLOOP tmp 1 "100" LOOP tmp 1 "%op(%tmp(1),+,1)" WUDD %tmp(1) 0 IF %op(%tmp(1),=,120) BREAK ENDIF ENDLOOP
The use of UDD variables
UDDs are used to store various status information:
- UDD 1 - 20: Call status, one UDD per intercom pair: 0 = Call not active. 1 = Call is active.
- UDD 101 - 120: Recordig status, one UDD per intercom pair: 0 = Recording not active. 1 = Recording active.
- UDD 5000: 0 = Listen-In not active. When Listen-In is active the UDD stores which pair is monitored. (44xx, where xx is the pair).