PSNT Public Switched Telephone Network
A telephone system such as small business telephone systems are connection oriented system. These system connects an internal phones of an organization. It also provides connection to different devices such as faxes, PSTN, modems, computers, extensions, etc.
MGC or MEDIA Gateway Controller, it handles the connection to the PSTN (telephone system) from the computer VOIP side.
PABX stands for Private Automatic Branch eXchange and refers to an automatic telephone switching system within a private enterprise. The system handles internal phone calls for businesses, and also provides a means of providing access to outside or 'trunk' calls.
VoIP is worldwide telephone system. There are two kind of it; one is using VoIP modem which is compatible for landline phones and the other one a web user interface VoIP which is flexible and compatible to almost all kinds of phones.
What is object-oriented systems development
What is object-oriented systems development
The only worldwide phone system I know is GSM.
DBMS Deesign implementation
Object Oriented Programming
Some people have a telephone system with more than one phone connected to the system. The extension number from the telephone system to that extension of the telephone system then become useful
Most of the world uses the metric system for measurement.
they are horizontally oriented system unit and vertically oriented tower