openast India
- VoIP Billing Software Provider
- Billing Software
- Installation and Support Services
- PC to Phone
- Web Call
- Blue Lava Prorietary 2 & 4 Port Analog VoIP Gateways
- Custom Open Source Billing Solution
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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