“Cloud PBX” is practically the same as the telephone system, only it
works within the Internet means, not the simple telephone line. Using this
service you don’t have to worry about how flexible and reliable is your
telephone system anymore.
Because Google Voice provides such a competitive and feature-rich service that not only includes free VoIP and SIP calls across North America and internationally at fantastic rates, in addition to a huge range of services such as voicemail, conference calls and voice transcription, it was inevitable that since its inception it would attract the ire of other competitors who would block it, or sue in courts to have the government legislate against it.