GROUP_COUNT()
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GROUP_COUNT() 

GROUP_COUNT([group[@category]])

Returns the number of channels in the specified group. If no group is specified, the group of the current channel is assumed.

; Query outgoing for number of channels:
exten => 123,1,Set(foo=${GROUP_COUNT(outgoing)})
[Note]

Internal help for this application in Asterisk 1.4:  

  -= Info about function 'GROUP_COUNT' =- 

[Syntax]
GROUP_COUNT([groupname][@category])

[Synopsis]
Counts the number of channels in the specified group

[Description]
Calculates the group count for the specified group, or uses the
channel's current group if not specifed (and non-empty).

diff output to internal help in Asterisk 1.2:  

- none -

See also. the section called “GROUP()”, the section called “GROUP_LIST()”, the section called “GROUP_MATCH_COUNT()”

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