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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.
Lucent Telecommunications,LLC
We are a voip Wholesale Service Provider, peering and routing voice services, interconnecting and inter-working peer to peer mode (SIP and H323), Residential and business phones.
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