Ringing (telephony)

ringingmagenta boxcall bellpower ringingring voltageringing signalringing voltage
Ringing is a telecommunication signal that causes a bell or other device to alert a telephone subscriber to an incoming telephone call.wikipedia
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Telephone

phonetelephonesLocal Telephone Service
Ringing is a telecommunication signal that causes a bell or other device to alert a telephone subscriber to an incoming telephone call.
If the called party's line is available, the exchange sends an intermittent ringing signal (about 75 volts alternating current (AC) in North America and UK and 60 volts in Germany) to alert the called party to an incoming call.

Ringing tone

ringback toneringback tonesAudible ringing
It is therefore also commonly referred to as power ringing, to distinguish it from another signal, audible ringing, which is sent to the originating caller to indicate that the destination telephone is in fact ringing. The exchange also sends a ringback tone to the calling party.
Audible ringing is typically a repeated tone that is not necessarily synchronous with the cadence of the power ringing signal that is sent to the called party.

Line card

Line Replacement UnitSubscriber Line Interface Circuit
When the subscriber line is called, a relay on the subscriber line card connects the ringing generator to the subscriber line.
In some telephone exchange designs, the line cards generate ringing current and decode DTMF signals.

Orange box

Orange Orange Box
A magenta box in conjunction with an orange box (which emulates the caller ID signal to create falsified data) is called a vermilion box.
One proposal to accomplish this involves an orange box used in conjunction with a magenta box, which in combination is called a vermilion box.

Vermilion box

A magenta box in conjunction with an orange box (which emulates the caller ID signal to create falsified data) is called a vermilion box.
The vermilion box incorporates three more basic phreaking boxes: the magenta box, which generates the AC ringing signal required to make the target telephone ring; the orange box, which generates caller ID (although it is not a proper call-waiting caller ID orange box that is used but a modified orange box that generates on-hook (idle state) caller ID); and the beige box that is used to conduct the actual conversation.

Telecommunication

telecommunicationscommunicationstelecom
Ringing is a telecommunication signal that causes a bell or other device to alert a telephone subscriber to an incoming telephone call.

Telephone call

callphone callphone calls
Ringing is a telecommunication signal that causes a bell or other device to alert a telephone subscriber to an incoming telephone call.

Alternating current

ACalternating-currentalternating
Historically, this entailed sending a high-voltage alternating current over the telephone line to a customer station which contained an electromagnetic bell.

Root mean square

RMSroot-mean-squarequadratic mean
In landline telephones, bells or ringtones are rung by impressing a 60 to 105-volt RMS 20-Hertz sine wave across the tip and ring conductors of the subscriber line, in series with the (typically) −48 VDC loop supply.

Tip and ring

pair of wiresR and Ttip
In landline telephones, bells or ringtones are rung by impressing a 60 to 105-volt RMS 20-Hertz sine wave across the tip and ring conductors of the subscriber line, in series with the (typically) −48 VDC loop supply.

Calling party

callercall originatorcall
The exchange also sends a ringback tone to the calling party.

Called party

calleebe calledcall receiver
When the called party answers by taking the telephone handset off the switchhook, the subscriber's telephone draws direct current from the central office battery.

Handset

telephone handsethandset receiverphone receivers
When the called party answers by taking the telephone handset off the switchhook, the subscriber's telephone draws direct current from the central office battery.

Telephone hook

switchhookhandset cradlehook switch
When the called party answers by taking the telephone handset off the switchhook, the subscriber's telephone draws direct current from the central office battery.

Direct current

DCdirect-currentD.C.
When the called party answers by taking the telephone handset off the switchhook, the subscriber's telephone draws direct current from the central office battery.

Party line (telephony)

party lineparty linestelephone party line
On multi-party lines, ringers would typically be connected from one side of the two-wire line to ground; a "tip party" and "ring party" would have bells connected from opposite sides of the line.

Distinctive ring

ringing pattern
If additional parties were added to the same line, distinctive ringing patterns would need to be used to identify the called subscriber; these were audible to the multiple users on the line.

Extension (telephone)

extensionextensionsextension number
A ring generator or ringing voltage generator is a device which outputs 20 cycle sinusoidal AC at up to 110 volts peak to power bells or annunciators in one or more telephone extensions.

Phreaking

phone phreakphreakphreaker
In terminology devised by phone phreaks, a ringing generator is a magenta box. The device can be used to simulate an incoming call by applying the AC ringing signal voltage to a POTS line to make the telephones on that line ring.

Plain old telephone service

POTSLocal Telephone Servicetelephone
In terminology devised by phone phreaks, a ringing generator is a magenta box. The device can be used to simulate an incoming call by applying the AC ringing signal voltage to a POTS line to make the telephones on that line ring.

Caller ID

caller line identificationCLIcall display
A magenta box in conjunction with an orange box (which emulates the caller ID signal to create falsified data) is called a vermilion box.

Telephone exchange

exchangescentral officeexchange
While a telephone exchange includes a central source of ringing voltage at the switchboard, a private branch exchange or telephone-based intercom must provide a local source of AC ringing voltage.

Business telephone system

PBXprivate branch exchangekey telephone system
While a telephone exchange includes a central source of ringing voltage at the switchboard, a private branch exchange or telephone-based intercom must provide a local source of AC ringing voltage.

Intercom

Intercom Systemintercom systemsentry phone
While a telephone exchange includes a central source of ringing voltage at the switchboard, a private branch exchange or telephone-based intercom must provide a local source of AC ringing voltage.

Theatrical property

propspropfilm prop
Theatrical performances often deploy a ringing telephone on-stage as a stage prop.