IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN).
IP Telephones
IP Telephony or VoIP (Voice over IP) is a method of enabling voice IP Telephony or VoIP (Voice over IP) is a method of enabling voice calls to be made over packet-switched data networks such as calls to be made over packet-switched data networks such as Local Area Networks (LANs), Wireless LANs (WLANs), Wide Area Local Area Networks (LANs), Wireless LANs (WLANs), Wide Area Network (WANs), or the Internet. In general, this means sending Network (WANs), or the Internet. In general, this means sending voice information in digital form in discrete packets rather than in voice information in digital form in discrete packets rather than in the traditional circuit-committed protocols of the public switched the traditional circuit-committed protocols of the public switched telephone network (PSTN). With traditional phone services, calls are telephone network (PSTN). With traditional phone services, calls are made by allocating the bandwidth of an entire voice circuit to each made by allocating the bandwidth of an entire voice circuit to each call. With IP telephony, voice data is compressed and transmitted call. With IP telephony, voice data is compressed and transmitted over an IP network. This means IP telephony uses substantially less over an IP network. This means IP telephony uses substantially less bandwidth than a traditional telephone call and is consequently bandwidth than a traditional telephone call and is consequently more cost-effective..
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