ptz , 1 month ago Re: landlines Technically they are from the CO (central office) once they hit the carrier's trunk. Re: Cell phones I'm not sure about 3G, but VoLTE (voice over LTE) is VoIP.
Re: landlines
Technically they are from the CO (central office) once they hit the carrier's trunk.
Re: Cell phones
I'm not sure about 3G, but VoLTE (voice over LTE) is VoIP.