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.
Dialmonster.com is a leading long distance international DID (Direct Inward Dialing) and prepaid phone cards distributing company. The company was established in 2002 with the goal of developing secure and efficient business models that would allow custom
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