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Introduction

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The first thing we need is a new music on hold class. This class should contain only a sound file with silence. This is of paramount importance because when the user hits the panic button, the call will be put on hold until the other party answers the call. Therefore it is important to upload a sound file with only silence as music on hold so there is no sound coming from the phone, only silence (see Record and playback audio messages for more information on how to upload the file to the music on hold class). For this example, a class called myspecialMOH was created. 

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Announcement

Since the use case is an emergency situation, it is a good idea to create an announcement to let the called party know that this is an emergency call.  You should of course create an announcement for this purpose (see Record and playback audio messages).  For this example, the sound Emergency was created. 

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Dialplan

We will need two Dialplan entries in order to implement the scenario.

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1. Set -> DIAL_OPTIONS -> A(00000/Emergency)n
2. Dial the trunk -> select a trunk

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Where:

• 9999 - pilot number that will be used to call the external number
• DIAL_OPTIONS : A(00000/Emergency)n - with this application we are configuring the announcement to be played to the called party as soon as the call is answered. Emergency is the name of the sound
• Dial the trunk - finally, use this application to call the number you want to notify about the situation and have an open mic in the room

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1. Set -> Music on hold -> select MOH
2. Custom application -> Page(Local/9999@users)

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Where

• 777 -  pilot number to be dialed to initiate the call
• myspecialMOH - the music on hold created with a ‘silence’ sound file
• Page(Local/9999@users) - this application will invoke the Dialplan in charge of calling the external number. Be sure to use the right extension number and Dialplan (in case you changed the pilot numbers or Dialplans). In this case, we have used 9999 but this of course can be changed to any number that you would like to use

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1. Call the external number
2. Play the emergency announcement
3. Join the audio from the originating phone microphone to the external call
4. Ensure that there are no noises or audio stream played on the sending phone

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