IP telephony is a modern way of voice communication in teleinformatic networks, using voice transmission mechanism in the so-called. Packet type (as is the case with data transmission) and using the same network that is used for data transmission.
Traditional telephony, using so-called. The commutation of the connection uses a separate, dedicated telephone network.
The company, which consists of a distributed branch network and has a wide network that guarantees high quality transmission, will be able to reduce the cost of its telephone bills relatively modestly. Voice service is in this case (also in a long distance relationship) wholly implemented as a Voice-over-IP service. This means that all in-house business calls are free (cost of telecommunication), and communication with the outside world within a given telephone area is a cost of local call.
Savings not directly related to connection charges are also the unification and simplification of ICT infrastructure. In a company that uses only IP telephony, structured cabling for the needs of phones is unnecessary. In the case of a company introducing a new building, for example, this may mean additional, significant savings.
Another issue is the use of subscriber voicemail systems. Traditional panel manufacturers are paying briskly for every gigabyte of disk space used to store voice messages. An analog IP-based system uses the storage space of standard servers, and therefore is significantly cheaper to expand.
It is possible to implement IP telephony from two standards:
This standard provides for server implementations for IP telephony services along with dedicated terminals – IP telephones. It is very important here the speed of installation and the ease of reconfiguring IP telephony compared to traditional telephones. IP phones all configurations including IP address, phone number, keystrokes etc. – download from server. They can be prepared and tested in one place, and the physical installation should be left to the less qualified person working in a remote unit. Thanks to that, for example, installing a company with hundreds of phones across the country can take up to a week, involving 2-3 engineers who would not even have to leave the Company Headquarters. Telephones sent to local offices were then wired with local power, and the connection consisted of transferring the network cable from the computer to the phone and connecting the computer to a second socket on the phone with a separate cable.
cheaper solution using existing telephone infrastructure is also possible. Assuming that each branch has a local PABX, it is possible to equip each PBX with a Voice-Over-IP module. After making the appropriate configuration, it will be possible to connect to any number in each branch as with an ordinary extension. This solution avoids the cost of buying IP phones.
IP Telephony enables to use applications that are impossible to obtain in traditional telephony; It is also much easier to integrate voice transmission and processing with other business applications. These include, for example, the phone book, which is accessible through a computer, in which the choice of a name will make a phone call to the indicated subscriber. Also available are advanced applications such as a unified messaging system, IP-based call centers, answering machine toggles the conversation depending on the contents of the computer’s diary and the incoming caller ID. The course of the teleconference is also changing. Open standards-based companies are working on a teleconference visualization system. This will make it possible to read the list of conference participants on the IP phone display, and the name of the person who is speaking at the moment will automatically be highlighted.
Unified IP-based messaging systems will allow you to receive voice mail as an e-mail attachment. You will also be able to make a phone call to your mailbox and listen to e-mails sent during your absence. Other applications include, for example, viewing services via a phone with a display, meeting schedules, weather forecasts, stock results, and full web browser integration on your computer.
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