Telephony signals

digital representation of sampled analog signals

thumb|Ringing noise from an electromechanical telephone thumb|Example of a short digital tune which could be used as a ringtone on a mobile phone

telecommunication signaling system

set of telephony signaling protocols

component that allows dialing numbers

the electronic exchange of information required to set up a telecommunications connection

tone played after dialing a telephone number while waiting for the call to be answered

signal encoder

pulse, tone

Telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone

type of call-progress tone

connection of a phone to a non-local office

error-detection code for decimal digits

tones used by NASA during human spaceflight communication

variation of frequency shift keying that uses more than two frequencies

sound of a telephone bell

telephone signal