Recording of conversations using Duplex Conference and AGA board

This article describes how the Duplex Conference can be used in combination with the AGA board to provide audio output for recording of conversations. The general concept is to convert a conversation to a 3-party duplex conference. The 3rd party is an AGA port. The audio from the AGA port goes to an external analog audio recorder. The stations involved can be analog (ASLT) stations or IP stations.

Software and hardware requirement

• As from AMC 10.50 the Duplex Conference is included as a standard feature of the AMC-IP board, no additional hardware (AGA board) is required for the conference mixing.
• An AGA board provides the audio output to the external recorder. One AGA bort has 6 "station" outputs. The audio output is 0 dBm level, available on the ab-wires of the port.

Configuration

In the following example there are 3 master stations (101 to 103) which needs to be recorded. The system can be configured to provide audio onxxxxxxxxxxxxxxx can be activated when calling to a predefined group of stations (UDP group 2), or one can choose to record all conversations.

Master stations

• Include the master stations in UDP group 1.
• Each master station must "own" a duplex conference channel. The conference channel is defined in the "EXP field" of each master. Here station 101 is using conference 8301, station 102 is using 8302 and station 103 is using 8303.
• In the Open Duplex window each master station must be set as "Master" of his conference. When the "Master" exit the conference all stations in this channel will be cancelled.

Substations

• Include the substations to be recorded in UDP group 2. If all conversations should be recorded, use UDP group 8 (all stations included by default).

AGA ports

• The AGA ports must be set to "Station" in the Exchange & System -> Boards window
• In order to make the event handler programming very general the AGA ports should be assigned directory number 9101, 9102 and 9103, i.e. 9 + the last three digits of the master station.
• The AGA ports should be set to "Duplex Station" in Users & Stations -> Station Type.

Event Handler programming

In Exchange & System -> Events, insert a new event with the following parameters:

Event Owner:	UDP group 1 (the master stations)
Event type:	08 – Conversation outgoing
Subevent:	0
When change to:	ON
When related to:	UDP group 2 (the substations) or All
Action:	$DISCON_ST L%1.dir U0
	$SDT L%1.exp '%2.nam'
	$ODC L%1.dir L%1.exp U1 U3
	$ODC L%2.dir L%1.exp U1 U3
	$ODC L9%1.dir L%1.exp U1 U3