Packet8 United States
- Hardware
- Hosted VoIP billing service provider
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- Call Relay VoIP Solutions
- Call Routing VoIP Solutions
- Phone To Phone
- Blue Lava Prorietary 2 & 4 Port Analog VoIP Gateways
- Billing system of own development
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.
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