GismoTel Denmark
- International VoIP Wholesale Provider
- Internet Telephony Service Provider
- Voip Termination ISP
- Call Relay VoIP Solutions
- Call Routing VoIP Solutions
- H.323 VoIP Gateway
- IP devices
- PC to Phone
- Phone To Phone
- SIP VoIP Gateway
- Termination
- Cisco Systems
- Lucent
- Quintum
- 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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