Some telephones, depending on the brand and model, have the intercom function, which allows to begin communication by sending the signal. When the signal comes, the telephone set rings a signal different from the standard ring tone call. After that the telephone temporarily switches off from the telephone line and works as an intercom.
Kernel Network was founded in 2001. Today Kernel Network is a universal operator providing SIP-telephony services in the corporate and consumer markets. The group of companies Kernel Network provides since 2002 the services of international telecommunicat
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