Call Google Voice Number with SIP

Say you are wanting to contact your friend, whose Google Voice Number is (555)123-4567. You could now sign up for a free SIP to SIP service, register your account via an SIP app (such as csipsimple or sipdroid), and contact +15551234567@sip.voice.google.com. Doing this would call your friend’s Google Voice number at no cost. The sip.voice.google.com suffix was not previously known to work in any capacity.