ADSL network telephone and method of carrying out such ADSL network telephone

Abstract

The incoming calls process of the method is: the high frequency signals are separated out from signals transmitted through telephone line by using ADSL separator, the high frequency signals are covnerted into IP data packet through high frequency signal conversion circuit; the central control circuit picks up the IP data packet and sends it to the voice compression and decompression circuit for decompression and decode; after decompression and decode the voice signals are sent to the telephone unit of PSTN. The response process is reversing proces sof the above steps. The device can directly get the address of public network, and has no need to dial access number.

Description

【Technical field】: [0001] The invention relates to a network phone and a method for realizing the network phone. 【Background technique】: [0002] ADSL (Asymmetric Digital Subscriber Line) technology is the most important broadband access technology at present. It uses the traditional subscriber telephone line of PSTN to realize the transmission of traditional analog telephone signals and high-speed data signals on one telephone line. ADSL MODEM is a device that modulates the digital signal sent by the terminal equipment into an electrical signal suitable for transmission on the telephone line, and at the same time demodulates the received line signal into a digital signal. By adopting ADSL access technology, broadband Internet and traditional PSTN network are connected to thousands of households through a twisted-pair telephone line. In this way, an ordinary telephone line can not only make traditional PSTN calls, but also make IP calls by dialing the IP phone access number...

AI Technical Summary

Problems solved by technology

[0005] 1. If the IP phone uses a static IP address on the public network, the cost is too high;

[0006] 2. The IP phone cannot directly assign a dynamic IP address on the public network;

[0007] 3. IP phones are generally located in a private network and access the public network through a gateway or proxy server, but the gateway or proxy server generally has a firewall. How to make the IP phone penetrate the firewall and communicate with the outside world has become an insurmountable obstacle

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