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  By default, all system extensions use a 'default' context. To use other contexts, you must create a new 'Custom Extension':
 - Login to the system administration
 - Navigate to 'Extensions: Custom'
 - Click on 'Add Custom Extension'
 - Set 'Extension'='1002' (Extension number)
 - Set 'Context'='test' (new 'test' context)
 - Click on 'Save'
 - Navigate to 'System: Conf Files'
 - Click on 'Extensions'
 - Add the following lines to the bottom
 
 [test] exten => 1002,1,Answer() exten => 1002,2,Playback(hello-world) exten => 1002,3,Hangup()   - Click on 'Save'
 - Click on 'Restart'
 
   Now if any system extension dials '1002', it will playback the 'hello-world' sound file    
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