Virtual urban call commutator and implement method therefor
Title：
Virtual urban call commutator and implement method therefor
Application Number：
 200310113531
Application Date：
 2003/11/14
Announcement Date：
 2004/11/10
Pub. Date：
Publication Number：
 1545306
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 H04L 12/24H04L 12/28H04M 1/26H04M 3/42H04M 11/06
Applicant(s)：
 Tsinghua University
Inventor(s)：
 Li Xing, Huang Yongfeng, Ruan Fang
Key Words：
 urban call, commutator, Virtual, implement method
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.
Claim：
Priority：
PCT：
LegalStatus：

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2008-4-17
  Selected patents owned by Tsinghua University filed in 2005 are loaded.
2008-3-31
  Selected patents owned by Tsinghua University filed in 2006 and 2007 are load.







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