Phone Call Recorder

precise tone plan

The Precise Tone Plan specification for the North American network defines the tones used for standard signaling in the PSTN. The tones are as follows: dial tone is a continuous tone having frequencies of 350 and 440 Hz at a level of -13 dBm ringback tone is defined as comprising frequencies of 440 and 480 Hz at a level of -19 dBm and a cadence of 2 seconds ON and 4 seconds OFF busy tone is defined as having frequency components of 480 and 620 Hz at a level of -24 dBm and a cadence of half a second ON and half a second OFF reorder tone, also called "fast busy" tone, contains the same frequency components as busy tone at a similar level but with a cadence of 0.25 of a second ON and 0.25 of a second OFF Prior to the Precise Tone Plan, devices used other frequencies and levels. Such tones generated by older equipment do not follow the Precise Tone Plan and are either formed as dual frequency tones or equivalently as ring modulated signals where a higher frequency is modulated by a lower frequency.

List of telephony terms:

3gpp - a-law - abbreviated dialing - adsl - ani - answering machine - apn - automatic ring back - b-channel - baud - bell 202 modem - bit rate - bonding - bri - busy signal - cable modem - call-progress tones - call accounting - call capture - call forwarding - call originator - call park - call pick-up - call transfer - call waiting - call waiting deluxe - called party - caller id - caller id spoofing - calling party - carrier wave - cbr - ccitt - cdma - cdma2000 - cellular repeater - celp - channel - clec - clock rate - codec - collect call - conference - conference call - crc - csd - d-channel - data compression - device driver - dial-up - dial - dial tone - direct-inward-dialing - direct distance dialing - distinctive ring - dnis - dsl - dsp - dtmf - dtr - duplex - echo cancellation - edge - extension - fax - fcc - fdma - fidonet - follow-me - g.711 - g.723.1 - g.723 - g.726 - g.lite - gprs - gps - gsm - h.323 - harmonic - headphones - hscsd - hspda - iad - idsn - internet call waiting - isp - ivr - jack plug - local loop - long distance - microcontroller - mobile phone - modem - modulation - mu-law - music-on-hold - night service - off-hook - on-hook - pabx - pager - payphone - pbx - pcm - pots - prank call - precise tone plan - pstn - pulse dialling - push to talk - ring modulation - ring tone - ringback - ringing signal - rj11 - roaming - serial communications - serial port - signal noise - sim - simplex - sit - sms - softmodem - switchboard operator - tapi - tdma - telecommunications - telemarketing - telephone - telephone call - telephone card - telephone company - telephone exchange - telephone line - telephone number - telephone numbering plan - telephone operator - telephone switchboard - telephony - tts - twisted pair - umts - v.32 - v.32bis - v.34 - v.42bis - vbr - vertical service code - voicemail - voip - vox - wap - wav - wi-fi - wimax - wire