Saturday, August 20, 2011

IP Telephony Vs Public Switched Telephone Network

Looking back at the public switched telephone network, which until now has roughly an access network including the wiring from the subscriber's home to the local exchanges and the necessary equipment, a transmission system which includes superior power and communication links between them.

As indicated above all the resources to intervene in the development of a telephone conversation cannot be used by another call until the first does not finish.

In IP telephony, fundamental change occurs in the transmission system: Now this task is carried out by a network based on IP protocol, packet switching, including the Internet. As for the access network may be the same as in the previous case, physically speaking (local loop), but in terms of services is evident that the advantage is geared towards the ability to exchange data, sending images, graphs and videos, as he is talking to someone.

The necessary elements so that they can make voice calls through an IP network depends largely on which terminal is used at both ends of the conversation.

These can be IP or IP terminals. Among the first is the IP phone, a multimedia computer, an IP fax, among the latter is a conventional telephone, a conventional fax, the former are able to deliver to its output the telephone conversation in IP packet format, as well as being part own IP network, the latter not lie, so you need an intermediate device to do this before connecting to the IP network transport.

It should be noted that in the event that one or both ends of the telephone communication are IP terminal, it is important to know how they are connected to the Internet. If you permanently, we can establish communication at any time. If a non-permanent, for example, through an Internet service provider (ISP) via conventional modem (dial-up access), communication is only possible at the time the dial-up user is connected Internet.

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