You can, using device_state function (I use asterisk 1.6.2.X)
Here is a example for a conference... when sombody enter to conference a
light up on my aastra phone:
exten => s,1,Set(DEVICE_STATE(Custom:confer)=INUSE)
exten => s,n,Meetme(5000)
exten => s,n,Hangup
exten => h,1,MeetMeCount(5000,users)
exten => h,2,Gotoif($[${users} = 0]?end:noend)
exten => h,3(end),Set(DEVICE_STATE(Custom:confer)=NOT_INUSE)
exten => h,4(noend),Noop(Users number = ${users})
On your subscribe context:
exten => conf,hint,custom:confer
On the phone configuration, choice BLF and asign conf to the key
Regards
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