Asterisk func group


Gets, sets or clears the channel group.
Each channel can only be member of exactly one group per category; categories can be employed for more fine grained group management, and thus can help to assign more than one group name per channel.




A channel may belong to one group per category only. So, if one wants to make a channel belong both to Zap and SIP groups because two such channels are being bridged, one would have to use GROUP(in)=Zap and GROUP(out)=SIP (creating the categories in and out).

  • This function may be both read from and written to.
  • The category argument is optional; if empty you need to use GROUP() in your dialplan (note the empty brackets)
  • *CLI> show function GROUP

Also note the existence of the special variable $OUTBOUND_GROUP: that group will be assigned to the channels created by the dial() app. There is also OUTBOUND_GROUP_ONCE which is unset after use. Both OUTBOUND_GROUP and OUTBOUND_GROUP_ONCE supports group@category (for exampe OUTBOUND_GROUP=mygroup@mycategory).

Return value

Returns the resulting string.


Example 1

; set the group name of the current channel to '3', and in addition assign the category 'cat8'
exten => s,1,Set(GROUP(cat8)=3)
exten => s,n,Set(GROUP(cat9)=hurray)
exten => s,n,Set(foo1=${GROUP(cat8)})
exten => s,n,Set(foo2=${GROUP(cat9)})

; the use of categories is optional
exten => s,1,Set(GROUP()=MyGroup)
exten => s,n,NoOp(This channel is member of group: ${GROUP()})

; clear the channels group for category 'cat8' (requires Asterisk 1.4.12 or later)
exten => s,1,Set(GROUP(cat8)=)

Example 2

${VOIPMAX} is a user-set Global which limits the concurrent number of outbound VOIP calls

; ${ARG1} - full dial string
; Return ${DIALSTATUS} = CHANUNAVAIL if ${VOIPMAX} exceeded
exten => s,1,Set(GROUP()=trunkgroup1) ;Set Group
exten => s,2,GotoIf($[${GROUP_COUNT(trunkgroup1)} > ${VOIPMAX}]?103) ;Exceeded?
exten => s,3,Dial(${ARG1}) ;dial it
exten => s,103,SetVar(DIALSTATUS=CHANUNAVAIL) ;deny call

See also

Created by: murf, Last modification: Mon 06 of Sep, 2010 (15:58 UTC) by JustRumours
Please update this page with new information, just login and click on the "Edit" or "Discussion" tab. Get a free login here: Register Thanks! - Find us on Google+