Returns a space-separated list of all the groups set for the
current channel.
exten => 123,1,Set(foo=${GROUP_LIST()})
Note
Internal help for this application in Asterisk 1.4:
-= Info about function 'GROUP_LIST' =-
[Syntax]
GROUP_LIST()
[Synopsis]
Gets a list of the groups set on a channel.
[Description]
Gets a list of the groups set on a channel.