View source for Parallel Ringing feature

Parallel Ringing is an extension to normal call with private ringing. 

It is an application used on ships. Captains suite has a living room and a bedroom. One station in each. When somebody calls either of the stations, both stations rings. Captain can accept call on either of the stations with M-key or lifting handset. The bridge can use private override, and get conversation to the primary called station. 

Previously the VA114D parallel connection board was used for this purpose. 

In first version of the AlphaCom SW support for this feature (AMCX10.22), the function has to be programmed using the EventHandler, using one event rule:

*Owner: Captains station (either single station, or UDP group)
*Event type: [[Private_Ringing_mode_%28Event_Type%29]]
*When change to: On
*Action: $[[PAR_RING]] %1.ref L111

L111 is the example Directory number of the additional station to include in ringing. Change that to the actual number to include.

Only one single station can be added in first version. Each $PAR_RING can only take one station. But a $PAR_RING which includes own station is silently ignored, so it is possible to create a single rule for two stations using UDP, and two $PAR_RING statements in the action.

Once the $PAR_RING action is triggered, the AlphaCom takes care of the rest: Allow accept of call from either station with M/OFF-HOOK, and disconnect stations when appropriate.