It is a type of communication between two or more people who share computer data in real time. The data can include screen, documents, graphics, drawings and applications that can be manipulated by participants.
The telephone number that is attached to a country, by dialing which it is necessary to take into account the code of the country or region you are calling to. When dialing the number from the same country you are calling to there is no need to enter the country code, but simply a phone number, sometimes a code of the region, might be a case when calling from one state or region to another, applicable to large counties (USA, Canada, Russia, China etc.).