Best thing to do is set up a ring service with a button programmed with the feature to turn it on/off.

I've encountered several instances when you can't call forward ALL to a HG.

And another thing; if you set up DNs to be part of a HG, they can't have the incoming lines represented. You will run into some weird bugs. Unless you want to have HGs ANSWERING incoming lines, don't assign them to your HG.

Yes, I'm a frenchie; have a problem with that?? Well, I do!!