Grouping call

hallo I need to kown how to configure grouping call.thank

We need to know what a “grouping call” is!

I agree with David that your question isn’t that clear to me either.

But i 'll take a guess:
If you want that multiple phones ring you could do
Dial(SIP/Phone1&SIP/Phone2&SIP/Phone3)

or you could create a queue and set the strategy to ringall (ringall is default as well)