You May Have Considered Eliminating Your Home Telephone And Replacing It With a Cell Phone Or Internet-Based System Such As A Digital Phone Or VOIP phone. But In Fact, The Landline Telephone Is A Very Reliable Communication Device And Offers Some Valuable Advantages.
1. A Hook Switch, Which Connects And Disconnects The Phone From The Network;
2. A Speaker, Which Can Be Used Without Picking Up a Handset And Several People Can Participate In a Call At The Same Time;
3. A Microphone, Through Which Sound Waves From Your Voice Compress And Decompress The Granules, Changing The Resistance And Modulating The Current Flowing Through The Microphone.
FSK is Frequency-Shift Keying and DTMF is Dual Tone Multi-Frequency, they are data transmission formats that carry caller information and caller ID detect systems. DTMF transmits the caller’s number; FSK is a more recent format for the transmission of caller’s number, or caller’s number and name depending on the network. Caller ID service depends on these data transmission formats being supported by the phone. In addition end users need to subscribe to these services with their local service provider.
