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.
One Unified specializes in consulting IP Telephone solutions for small and medium size businesses. For businesses on a tight budget but still want the all the bells and whistles, we recommend and use the Asterisk Telephone Solution. You can have the best
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