Talk Telecom China
- International VoIP Wholesale Provider
- Voip Termination ISP
- Call Routing VoIP Solutions
- E1 Bulk Wholeseller
- Partnering for Origination and Termination
- PC to Phone
- Phone To PC
- Phone To Phone
- Termination
- Web Call
- Web To Phone
- Audiocodes
- 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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