The signal is transmitted in digital form through IP telephony technology, which combines the characteristics of a regular telephone and the Internet. IP telephony allows you to make calls over the Internet.
SIP (Session Initiator Protocol) is a type of protocol that provides information exchange over the network in multimedia format. The uniqueness of the protocol is that it allows to open any number of communication sessions at the same time. The SIP protocol makes it possible to exchange audio and video messages over the Internet in real-time without losing sound quality.
Creation of virtual channels (1 "SIP" number).
Monthly subscription fee for one session (Virtual channel).