Now this is far from a complete example but it doesn't allow more than 1 person to use the card at the same time(thats right only one person at a time can use the card).  Its just an example and shouldn't be used in production.  This is only to show how you can do complicated operations using only extension logic.  The sounds are from asterisk-sounds.
 
They are far from the best ones for this but hey I just wanted to prove it could be done and show a use of app_groupcount
 
NEXT!!!
 
bkw
 

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