Dipus Telecom Bangladesh
- International VoIP Wholesale Provider
- Phone To Phone
- Cisco Systems
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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.
WebPhone
WebPhone, a provider of voice over Internet Protocol (VoIP) technology, was founded in 2002. WebPhone provides PC2Phone calling service using a worldwide VoIP network. The company is based in Portugal and recently opened sales and customer service offices
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