voice over IP

This application named Unifed Messaging over IP intends to integrate three major methods for Electronic communication, Voice (IP telephony), Mail (E-Mail and Voice Mail), Fax and also document conferecing which integrates the above three facilities. If the same network is made to carry these above messages over the same protocol (IP) then a single device can be made to receive all of them. The device on receiving the messages will identify its nature and direct it to its corresponding display device. Thus a voice call would be automatically sent to the speakers or headphone, while fax message can be sent to the printer or the monitor for printing or displaying and an3-mail message can be stored on the mail client. Further all the above messaging capabilities can be built into the same software. All these messages can be stored in the inbox of the same client software, as the incoming e-mail is stored today. Document Conferencing allows multiple parties to communicate verbally while viewing the same document on their computer screens. Until recently Document Conferencing was based on the use of public switched networks for voice communications while software on multiple computers used the corporate network or the Internet to provide real time document editing capability. With the ability to transmit voice over data, it becomes possible to integrate voice and data transmission requirements onto common network infrastructure. This not only makes it simpler to coordinate software but also eliminates the use of PSTN, which could result in considerable savings especially if document conferencing audio & data are ansported between in international locations. To setup a VolP communication we need : 1. First the ADC to convert analog voice to digital signals (bits) 2. Now the bits have to be compressed in a good format for transmission :there are a number of protocols we'll see after. 3. Here we have to insert our voice packets in data packets using a real-time protocol 4. We need a signaling protocol to call users 5. At AX we have to disassemble packets, extract data, then convert them to analog voice signals and send them to sound card (or phone) 6. All that must be done in a real time fashion because we cannot wait for too long for a vocal answer.

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