"Voice over IP is the technology of Gateways are the key component required to digitizing sound, compressing it, breaking it facilitate IP Telephony. up into data packets, and sending it over an A gateway is used to bridge the traditional IP (internet protocol) network where it is circuit switched PSTN with the packet reassembled, decompressed, and converted switched back into an analog wave form.." The transmission of sound over a packet Internet. The gateway allows the calls to switched network in this manner is an order transfer from one network to the other by of magnitude more efficient than the converting the incoming signal into the type transmission of sound over a circuit of signal required by the network it is switched network. required to send it on. For example, A PC As mentioned before, VoIP saves bandwidth user wishes to call someone using a also by sending only the conversation data conventional phone. The PC sends the IP and not sending the silence periods. This is a packets containing digitized voice to the considerable saving because generally only gateway. one person talks at a time while the other is listening. By removing the VoIP packets Requirements of a VoIP containing silence from the overall VoIP traffic we can reach up to 50% saving. In a The requirements for implementing an IP circuit switched network, one call consumes Telephony solution to support Voice Over the entire circuit. That circuit can only carry IP varies from organization to organization, one call at a time. and depends on the vendor and product In a packet switched network, digital data is chosen. The following section aims to chopped up into packets, sent across the identify the fundamental requirements in the network, and reassembled at the destination. general case and is split into 3 sections: This type of circuit can accommodate many Software Requirements transmissions at the same time because each Hardware Requirements packet only takes up what bandwidth that is Protocol Requirements necessary.. Internet Telephony simply takes advantage of the efficiencies of packet Software Requirements switched networks.
"Voice over IP is the technology of digitizing sound, compressing it, breaking it up into data packets, and sending it over an IP (internet protocol) network where it is reassembled, decompressed, and converted back into an analog wave form.." The transmission of sound over a packet switched network in this manner is an order of magnitude more efficient than the transmission of sound over a circuit switched network. As mentioned before, VoIP saves bandwidth also by sending only the conversation data and not sending the silence periods. This is a considerable saving because generally only one person talks at a time while the other is listening. By removing the VoIP packets containing silence from the overall VoIP traffic we can reach up to 50% saving. In a circuit switched network, one call consumes the entire circuit. That circuit can only carry one call at a time. In a packet switched network, digital data is chopped up into packets, sent across the network, and reassembled at the destination. This type of circuit can accommodate many transmissions at the same time because each packet only takes up what bandwidth that is necessary.. Internet Telephony simply takes advantage of the efficiencies of packet switched networks. Gateways are the key component required to facilitate IP Telephony. A gateway is used to bridge the traditional circuit switched PSTN with the packet switched Internet. The gateway allows the calls to transfer from one network to the other by converting the incoming signal into the type of signal required by the network it is required to send it on. For example, A PC user wishes to call someone using a conventional phone. The PC sends the IP packets containing digitized voice to the gateway. Requirements of a VoIP The requirements for implementing an IP Telephony solution to support Voice Over IP varies from organization to organization, and depends on the vendor and product chosen. The following section aims to identify the fundamental requirements in the general case and is split into 3 sections: Software Requirements Hardware Requirements Protocol Requirements Software Requirements