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.
We specialize in
Fax Store-and-Forward
and Fax Broadcast,
Real competitive
low-cost International Calling,
Callback and Call-through,
Conferencing
as well as
VoIP Phone Services
and Voice Wholesale