Which Is Not True About VoIP

Multiple Choice

Which is not true about VoIP?

A) It is used as an alternative to PBXs, PAXs, and PABXs.
B) When a VoIP telephony system needs to be connected to the outside world, a specialized gateway is used to convert the IP packetized voice data into a signal that can be transmitted over a public switched telephone network for regional, long distance, or both voice communications.
C) VoIP implementations can be expensive, because organizations have to install special networks.
D) None of the above.