Panel call indicator
Telephone signaling protocol
general/telephony-signals
Call-progress tone
Telephony signal
general/telephony-signals
Supervision (telephony)
Type of signaling in telephony
general/telephony-signals
Off-hook tone
Audible alert on a telephone left off-hook
general/telephony-signals
Single-frequency signaling
Telephony signaling technique
general/telephony-signals
Ringing tone
Audible electrical signal in telecommunication systems
general/telephony-signals
Multi-frequency receiver
general/telephony-signals
Metering pulse
general/telephony-signals
Digital milliwatt
Test signal in telecommunications
general/telephony-signals
Robbed-bit signaling
Signaling protocol
general/telephony-signals
On- and off-hook
Telephone respectively off- and on-line
general/telephony-signals
Sender (telephony)
general/telephony-signals
Ringing tone
Audible electrical signal in telecommunication systems
general/telephony-signals
Multi-frequency receiver
general/telephony-signals
Metering pulse
general/telephony-signals
ToneScript
general/telephony-signals
Panel call indicator
Telephone signaling protocol
general/telephony-signals
Call-progress tone
Telephony signal
general/telephony-signals
On- and off-hook
Telephone respectively off- and on-line
general/telephony-signals
Common-network interface ring
Telephony signaling device
general/telephony-signals
Panel call indicator
Telephone signaling protocol
general/telephony-signals
Call-progress tone
Telephony signal
general/telephony-signals
Supervision (telephony)
Type of signaling in telephony
general/telephony-signals
Off-hook tone
Audible alert on a telephone left off-hook
general/telephony-signals
Single-frequency signaling
Telephony signaling technique
general/telephony-signals
Disconnect tone
Type of call-progress tone
general/telephony-signals
Disconnect tone
Type of call-progress tone
general/telephony-signals
On- and off-hook
Telephone respectively off- and on-line
general/telephony-signals
Supervision (telephony)
Type of signaling in telephony
general/telephony-signals
Off-hook tone
Audible alert on a telephone left off-hook
general/telephony-signals
Single-frequency signaling
Telephony signaling technique
general/telephony-signals
Compelled signalling
Class of telecommunications signalling protocols
general/telephony-signals
Signalling System R2
general/telephony-signals
Differential pulse-code modulation
Signal encoder
general/telephony-signals
Special information tone
Three-beep signal indicating a call did not go through correctly
general/telephony-signals
E and M signaling
general/telephony-signals
Ringing tone
Audible electrical signal in telecommunication systems
general/telephony-signals
Hook flash
Telephone signal
general/telephony-signals
Robbed-bit signaling
Signaling protocol
general/telephony-signals
Multi-frequency receiver
general/telephony-signals
Metering pulse
general/telephony-signals
Loop start
general/telephony-signals
Robbed-bit signaling
Signaling protocol
general/telephony-signals
Disconnect tone
Type of call-progress tone
general/telephony-signals
Signaling System No. 5
1970s telephone signaling system
general/telephony-signals
Ground start
general/telephony-signals
Supervision (telephony)
Type of signaling in telephony
general/telephony-signals
Off-hook tone
Audible alert on a telephone left off-hook
general/telephony-signals
Ringing tone
Audible electrical signal in telecommunication systems
general/telephony-signals
Robbed-bit signaling
Signaling protocol
general/telephony-signals