Fongo powers free calling solutions for a number of brands. This forum includes information and tips on all of those offerings. Note that your specific services may vary based on the specific Fongo product that you're using.
I just want to share the phone numbers that I forward telepests to. (My teenage daughter was watching me updating the "concierge" of the web portal of my sister's voip provider and she noticed that I had been forwarding telepests/scammers to 905-111-1111 which obviously does not exist. She quickly suggested 2 numbers from the GTA...which I actually used to replace 905-111-1111).
CounterPath's Bira actually has a button that supports transferring calls to another extension. Instead of wasting my 2 incoming/outgoing channels that FPL already provides me, I transfer them to a nastier internal rejection extension I have set up on my FreeSwitch box.
And no, I won't post the DID number to that nasty rejection hotline. It's just simply NOT work/mind safe...