Category
page 1Telephony signals
pulse-code modulation
digital representation of sampled analog signals
ringtone
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
Dual-tone multi-frequency signaling
telecommunication signaling system
Signalling System No. 7
set of telephony signaling protocols
rotary dial
component that allows dialing numbers
signaling
the electronic exchange of information required to set up a telecommunications connection
ringback tone
tone played after dialing a telephone number while waiting for the call to be answered
differential pulse-code modulation
signal encoder
pulse dialing
pulse, tone
dial tone
Telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone
busy signal
type of call-progress tone
Foreign exchange service#Foreign eXchange Station
connection of a phone to a non-local office
two-out-of-five code
error-detection code for decimal digits
Quindar tones
tones used by NASA during human spaceflight communication
multiple frequency-shift keying
variation of frequency shift keying that uses more than two frequencies
ringing
sound of a telephone bell
Hook flash
telephone signal