0 VOIP technology

VOIP is an alternative low-cost communications. VOIP technology now starting to be applied at various agencies including government, private and state-owned enterprises. It is due to VOIP technology is no less good on the appeal with a regular phone and are more likely to be developed with the Internet network, and most importantly the operational cost of VOIP is cheaper than a regular phone. how to use the phone via VOIP? Here's a VoIP call sequence:

1. Caller lifting the handset, signaling an off-hook condition to a VoIP application layer signaling.
2. VoIP application layer session to open the dial tone (dial tone) and wait for the caller to do the dialing to the destination.
3. When callers make dialing a number, dial digits are accumulated and stored by the application session.
4. After accumulating a certain digits to fit the pattern of destination address, telephone number is mapped to an IP host. IP host has a direct connection to the connection destination phone number.
5. Application form the next session of transmission and reception channels for each direction of the IP network.
6. Coder-decoder (codec) for both ends of the connection is activated, and the conversation is processed using RTP / UDP / IP protocols. Various voice signal is compressed, packaged to form the packets, and then transported through the network.
7. Signaling that can be detected by the voice ports after the complete call setup, and then carried through an IP network.

In a private network or corporate network, it is recommended to use the Private IP, so as not to conflict later on if the network is integrated with the Internet public.

Simple and cheap are the advantages of VOIP. interested in using VOIP?

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