VoIP Technology

VoIP vs. Traditional Phones

VoIP technology has several advantages over circuit switching. For example, packet swtiching allows several telephone calls to occupy the amount of space occupied by only one in a circuit switch network. About 3 or 4 calls from a VoIP system could fit in the space of one call from a circuit switch system. And that doesn't even factor in VoIP's use of data compression.

Let's say that your company purchased equipment and got a service contract so you can use VoIP. You installed a dozen phones and a VoIP gateway. A VoIP Gateway is essentially a switch used to connect multiple phones to each other and an outside line.

Gateways are used to connect two devices that run on two different kinds of networks. Our gateway connects our VoIP phones, which use a packet switch network, with the standard circuit switch signal.

A VoIP Phone call

You pick up the reciever which sends a signal to the VoIP gateway.

The gateway receives the signal and sends a dial tone, letting you know you are connected.

You dial the phone number. The number is temporarily stored in the VoIP gateway.

The gateway checks to make sure the number is in a valid format.

The gateway then determines who to map the number to. In maping, the number is attached to the IP adress of another device called the IP host. The IP host is typically another VoIP gateway that is connected directly to the hpone system of the number you are calling.

A session is established between your VoIP gateway and the other party's IP host. Now both party's can send data packets.

You talk for a while. During the conversation, your gateway and IP host transfer data packets.

You hang up, the circuit between your line and your VoIP gateway is closed. Your gateway sends a signal to IP host, closing the session.



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