IP-telephony (VoIP-telephony) — type of communication which lets use the telephone via internet channel. Today IP-telephony is more convenient and beneficial mode of transmission of voice traffic. IP-telephony transforms voice in digital packets and then passes to any ground point through internet. For using IP-telephony it does not matter where you are, you may call and receive calls free of payment from any place and price does not change.
The reasons you need it?
How to use?
What you get in result?
What is IP-telephony?
IP-telephony, VoIP, SIP, Internet-telephony – all these appellations are referred to one way of communication. Let’s see it in more details:
So, IP-telephony is a type of communication which provides signal transmission (for example: voice) in world internet network or any other (local) IP-networks. Voice packets are preliminary digitized and transferred through communication channel as usual in tabloid form (depending on coder) in order to reduce the volume of passed information by increasing the quality of communication.
Quality of IP-telephony
Every user who has access to internet may use IP-telephony but everybody will have different quality of communication. Internet network is a system of communication channels of different internet operators (joined each other) and quality of IP-telephony depends on internet you use and mostly depends on communication channels which your provider (operator) of VoIP-telephony uses. Circumstantially it depends on equipment («hardware») of provider and user but mostly depends on quality of internet channel from provider to user. Internet provider may say about high quality of communication up to 30 Мb/s, but in result «packets» of IP-telephony may be blocked or be in bottom priority of passing through operators’ networks.
In case of communication’s deterioration (reveal: echo, strays, voice distortion of talker or voice delay) you should do a simple command PING, which allows to see who has a problem.
PING (derives from «Packet InterNet Grouper») — is a duration of time when a signal sent from
one widget comes to another one. It is measured by milliseconds (msec). The time of ping depends on speed
and occupancy of communication channels over a distance of one widget to another one. Also PING is a
support program on each computer. To run this program in Windows (Menu Start – Line of command):
Ways of calls through IP-telephony
There are a lot of ways of calls through IP-telephony; everything depends on tasks and budget of customer. You may use IP-telephony without any equipment and downloaded IP soft phone; you just need only microphone and earphones (flash-telephone). If you need telephone for outgoing and incoming calls, for example, at home, you may buy a standard SIP adapter (VoIP gateway) from 2000 rubles (where internet channel is connected from one side and usual phone line from another side) and connect to Plain old telephone service. It is possible to match a standard IP telephone for office (from 3000 rubles), IP adapter (gateway service for 2-16 lines) or full IP АТS as automatic telephone station (which provides up to 100 simultaneous connections).
You may see all the ways of connection and match appropriate one for you in division «Settings - IP-telephony».