Virtual urban call commutator and implement method therefor

An adapter and local telephone technology, applied in the direction of telephone communication, telephone structure, transmission system, etc., can solve problems such as difficulty in interoperability of IP telephone products, and achieve the effect of reducing protocol overhead, improving utilization rate, and high performance-price ratio.

Inactive Publication Date: 2004-11-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 3. Since these IP products all follow the relevant international standards, but the diversity and complexity

Method used

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  • Virtual urban call commutator and implement method therefor
  • Virtual urban call commutator and implement method therefor
  • Virtual urban call commutator and implement method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0071] Two equivalent adapters are needed to realize the call between A and B: adapter A and adapter B. The connection method when realizing virtual local telephone communication is as follows: figure 1 Shown:

[0072] The adapter has only 3 ports. These 3 interfaces function as figure 2 shown.

[0073] (1) The block diagram of the adapter is as follows image 3 As shown, it has five small parts, see image 3 :

[0074] 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, such as Figure 4 Shown:

[0075] 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 vol...

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PUM

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Abstract

The invention is a virtual local telephone commutator and its implementing method, containing: user line interface circuit, local telephone line interface circuit, data processing control circuit, Ethernet interface and power supply, where the data processing control circuit is responsible for controlling the other circuits and man-machine interactive interface, and for quantization and coding of voice signals, voice data compression, packaging IP and providing Ethernet interface. The main implementing modes are virtual city telephone calling mode and local telephone roaming function. And the other modes are point-to-point direct calling mode and ordinary city commutating mode. It has the characters of simpler commutator, lower cost, multiple calling mode, and simple use. It infinitely extends a local telephone line by Internet to implement and exceed the whole function of an IP telephone.

Description

Technical field: [0001] The virtual local telephone adapter and its realization method belong to the technical field of Internet voice communication. Background technique: [0002] 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. [0003] There are several ways to carry out voice communication (that is, IP telephone) through the Internet: computer-computer, ordinary telephone-ordinary telephone, computer-ordinary telephone, Ethernet telephone-Ethernet telephone, Ethernet telephone-ordinary telephone, etc. Among them, the computer-to-computer communication is based on the hardware of the sound card and the network card, and the voice compression and communication protocol (such as H.323) are realized...

Claims

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Application Information

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IPC IPC(8): H04L12/24H04L12/28H04M1/26H04M3/42H04M11/06
Inventor 李星黄永峰阮方邓北星
Owner TSINGHUA UNIV
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