Realization method for virtual city call commentator

An implementation method and technology of an adapter, which are applied in the directions of telephone communication, automatic switching office, electrical components, etc., can solve the problems of interoperability difficulties of IP telephony products, and achieve the effect of reducing protocol overhead, improving utilization rate, and small size.

Inactive Publication Date: 2008-08-13
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] 3. Because these IP products follow relevant international standards, but the diversity and complexity o

Method used

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  • Realization method for virtual city call commentator
  • Realization method for virtual city call commentator
  • Realization method for virtual city call commentator

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0060] Two equivalent adapters are needed to realize the call between A and B: adapter A and adapter B. The connection mode when realizing virtual local telephone communication is shown in Figure 1: the adapter has only 3 interfaces. These three interface functions are shown in Figure 2.

[0061] (1) The block diagram of the adapter is shown in Figure 3. It has five small parts, as shown in Figure 3:

[0062] Subscriber Line Interface (XS) circuit. This circuit provides the interface of the user's telephone set. The telephone connector has only two pins: Tip and Ring, which form a current loop with the switch output to transmit analog signals, as shown in Figure 4:

[0063] The subscriber line interface module of the adapter is equivalent to the subscriber line interface module of the switch, which is responsible for feeding the telephone line, feeding the ringing stream, and detecting the user's off-hook and on-hook. When the phone is on-hook, the voltage at both ends of ...

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PUM

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Abstract

The invention relates to a virtual local calls adapter and the implementation method thereof, belonging to the field of Internet voice communication technology. The adapter is characterized in that: the adapter comprises a subscriber line interface circuit, a local call line interface circuit, a data control circuit, an Ethernet interface and a power supply. The data control circuit is used for control of the above circuits and human-computer interaction interface, quantifying and coding of voice signals, compressing of voice data, packing IP packet, and providing Ethernet interface. The implementation ways are mainly virtual local call calling mode and local call roaming function. Point-to-Point direct calling mode and common local adapting mode can also be realized. The invention has the characteristics of simple adapting equipment, low cost, multiple communication modes, simple usage, a local call subscriber line is unlimited extended by Internet, and all functions of IP telephone are realized.

Description

[0001] This application is a divisional application of: [0002] Application date: November 14, 2003; application number: 200310113531.3; [0003] Invention name: virtual local telephone adapter and its realization method technical field [0004] A method for realizing a virtual local call adapter belongs to the technical field of Internet voice communication. Background technique [0005] IP telephony technology has been fully developed now, including voice compression coding technology (such as H.723.1), real-time transport protocol (RTP: Real-time Transport Protocol), resource reservation protocol (RSVP: Resource Reservation Protocol), call establishment and control protocol H.323, SIP, etc. are quite mature. [0006] Voice communication (i.e. IP telephony) methods through the Internet now include: computer-computer, ordinary telephone-ordinary telephone, computer-ordinary telephone, Ethernet telephone-Ethernet telephone, Ethernet telephone-ordinary telephone, etc. Amo...

Claims

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Application Information

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IPC IPC(8): H04M7/00H04M3/00H04M9/00
Inventor 李星黄永峰阮方邓北星
Owner TSINGHUA UNIV
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