Abstract: A device and method that enables Internet communication products equipped with Web linkage functions to have the functions of a voice mailbox available only in general telecommunication systems or voice telephones through the multimedia service of the Internet. The invention uses the sound recording, playing functions and Internet communication of Internet communication products to turn voice data recorded and receiver's data into a voice message packet which is then sent to a Web server for storage, so that voice message can be retrieved from the voice mailbox when receiver's Internet communication products are linked to the Web server by Internet, to receive and send voice mail as well as use the voice mailbox.

Abstract: The specification discloses a data transmission method by automatic frequency control, which automatically selects an optimal data transmission rate between a data-sending end (such as a personal computer) and a mobile phone. An automatic frequency control mechanism (program) is provided at the data-sending end that can automatically change the data transmission rate. Through the communications and protocol between the data-sending end and the mobile phone, the automatic frequency control mechanism starts to look for the highest transmission rate that both of them can reliably transmit data through a cable before transmitting data. Afterwards, real data transmission operations start so as to achieve the goal of transmitting data in the fastest speed and the shortest time.