What Is the Different Between IPT (Internet Protocol Telephone) and VoIP (Voice Over Internet Protocol)?

Voice over Internet Protocol is a protocol meant for the transmission of voice through the Internet or other packet switched networks like LAN or WAN. VoIP differs from IP telephone in the sense that VoIP actually transmit voice rather than the protocol implementing it.
In IP telephony or Internet Telephony....u may call it broadband also..here the voice is actually broken down into bits and bytes and by techniques known as multiplexing and demultiplexing they actually tranmsit voice across the internet ...so the basic difference being the method in which both of them transmit voice..