No's 5012/5013/5014/5015/5025

React (5012AR)
This is the basic model in the React range. It provides secrecy and last number re-dial plus private exchange functions such as recall. The React range was introduced in 1990.

Key Features:

  • LD and MF4 dialling and mixed signalling
  • Earth and Timed-Break recall
  • Last Number redial
  • Mute
  • Ringer volume (Hi/Lo/Off)
  • Wall mountable

Colour: Ivory

React 120 (5013AR)
This model has a 20 address buttons for pre-stored numbers. It was introduced in 1990.

Key Features:

  • LD and MF4 dialling and mixed signalling
  • Earth and Timed-Break recall
  • 20 direct memory buttons

Colour: Alpine White


React 220 (5014 AR)
Telephone with 20 address buttons, with a visual display screen that shows the number as you dial and can then be set to time the call so you can check the cost.  It also doubles as a useful desktop clock.  It was introduced in 1990.

Key Features:

  • LD and MF4 dialling and mixed signalling
  • Earth and Timed-Break recall
  • 20-number memory
  • LCD display
  • Clock
  • Call timer
  • Last number redial
  • Secrecy button
  • Adjustable tone caller
  • Wall mountable

Colour: Alpine White.


React 320 Plus (5025 AR)
This phone adds a built-in loudspeaker and microphone to the features of the React 220. That means you can add hands-free phoning to a 38-number memory, visual display, call timer and clock.  It was introduced in 1990.

Key Features:

  • LD and MF4 dialling and mixed signalling
  • Earth and Timed-Break recall
  • Hands-free operation and on-hook dialling
  • 38-number memory LCD
  • Clock
  • Call timer
  • Last number redial
  • Secrecy button
  • Adjustable tone caller
  • Wall mountable

Colours: Alpine White and Black

Additional Information

The BT React range of Telephones are intended for retail only.

The range comprises five models:-

  • Tele 5012 AR - React
  • Tele 5013 AR - React 120
  • Tele 5014 AR - React 220
  • Tele 5015 AR - React 320
  • Tele 5025 AR - React 320 Plus

They are all similar in outline and offer the following facilities:-

  • LD or MF4 signalling (customer switchable) and mixed signalling
  • Earth-Loop or Timed-Break recall (customer switchable)
  • 32 Digit Last-number redial memory
  • Tonecaller with two level volume control and off position
  • Secrecy, microphone cut-off button (latching facility on teles 5015 AR & 5025 AR only)
  • 20 Address memory buttons (all models except tele 5012 AR and 5025 AR), each address can store up to 16 digits including and # codes but not Earth recall. Tele 5025 AR has 38 Address memory buttons 1 - 19 can each store 2 numbers, accessed by button 20 used as a 'shift key')
  • For table or wall mounted use, when used wall mounted, the case moulding below the plunger should be reversed to provide a handset retaining lug and the wedge shaped base bracket turned round to allow the telephone to rest against the wall at a slight angle.
  • Excess line cord may be stowed in wedge shaped base bracket
  • LCD display of time, call timer, dialled digits and stored numbers (5014 AR, 5015 AR and 5025 AR only)
  • Handsfree LST facilities (5015 AR and 5025 AR only)

A three position slider switch (marked LD-MFT-MFE) is provided on the side of the instrument. As supplied this is normally set to LD to offer Loop Disconnect signalling with Earth-Loop recall but may be adjusted to offer MF signalling with Timed Break recall (MFT) or MF signalling with Earth-Loop recall (MFE) as required.

Mixed Signalling is the facility whereby a call may be originated in the Loop Disconnect mode and continued for the duration of the call in the MF4 mode by pressing the 'MF' button, to access certain network based facilities (e.g. Voicebank, Display page, Home banking). There will be a slight delay before subsequently keyed digits are transmitted in MF in all 'React' telephones.

There is no provision for storing PBX access pauses in the last number redial store of the 5012 AR, hence last number redial facility on this telephone will not work on external calls on PBXs that require access pause.

PBX pauses may be stored in last number redial and stored number stores by pressing the 'Pause' button on the 5013 AR, 5014 AR and 5015 AR models only.

Made by Inventa (Malaysia)

Distributed exclusively by British Telecom

React telephones are approved for use on DELs and as extensions to PBXs in categories 1,3,5 & 7 under the following approval numbers:-

5012 AR S/2981/3/J/501122
5013 AR S/2981/3/J/501123
5014 AR S/2981/3/J/501124
5015/25 AR S/2981/3/J/501121
Modifications which have not received appropriate approval must not be carried out as to do so would invalidate approval, making connection unlawful. Prestel RADAR database (page 54031) details those PABX equipment's to which the telephones may be connected as extension instruments.

React telephones have a REN of 1.

React 320/320 Plus Handsfree facility should operate acceptably on line power in the majority of situations.

When used on DELs where line current is below 40mA or on PBXs with constant current feeds below 25mA (see below), LST volume and clarity may be improved by the use of a 'Telephone Adaptor 20S' (Mains power unit requiring a plug with 2 Amp fuse).

Telephone Adaptor 20S (for React 320/320 Plus)
Most likely to be required with Consort, Renown, AESS/Senator.
May be required with Regent, Kinsman, Viceroy, TSX 50, Monarch, Minimaster 3. Not likely to be required with Pentara, Escort, BTeX/SL1, SX 2000, MDX, Navigator.

New React telephones carry an 18 Month manufacturer's warranty to BT from the date of manufacture as shown on the base of the instrument (year and week marking forming the first four digits of the serial number). Customers will be given a 12 Month bring-back warranty.

DESCRIPTION                                       BT Item Code
React             Tele 5012 AR  Alpine            877686
React             Tele 5012 AR  Ivory             877687
React  120        Tele 5013 AR  Alpine            877689
React  220        Tele 5014 AR  Alpine            877691
React  320        Tele 5015 AR  Alpine            877693
React  320        Tele 5015 AR  Black             877713
React  320 Plus   Tele 5025 AR  Alpine            877848
React  320 Plus   Tele 5025 AR  Black             877847
Telephone  adaptor 20S                            877694

Idle - Capacitor loop, React telephones draw-on-hook current to maintain stored number memory (typically 5 micro Amps), this may give apparent low-loop line test conditions.

Seized - Normal off-hook press button telephone loop. The electronic keypad and transmission circuitry may give 'high resistance' tele-loop line test conditions as with other press button telephones.

ADDITIONAL INFORMATION Last number redial and stored number memories are protected by 4 'AA' size Alkaline cells in the base of the telephone (3 cells in 320 Plus) if the telephone is disconnected from line. There is no provision for batteries in Tele 5012.

Batteries should be changed annually and the telephone must be disconnected from line whilst batteries are being replaced. Stored number memory cannot be guaranteed if batteries are removed for more than 5 minutes whilst the telephone is disconnected from line.

All React telephones have good immunity against RFI from 50kHz to 10MHz.
Teles 5012 and 5013 have fairly good immunity above 10MHz, Teles 5014 and 5015 have poor immunity above 10MHz.

Investigations continue and it is recognised that 'Breath Puff Distortion' with React range telephones is a subjective problem that only certain individuals in certain circumstances come across.

The handset design with the flat inside surface can when used by some customers result in the alignment of the mouthpiece and microphone being too close to the mouth and nose. This in turn results in 'Breath Puff' noise of certain speech patterns being fed at distorted levels back to the user. This sound is not transmitted down the line to the other party. However, modifications made to the React 320 Plus greatly improve this models performance.

The way to deal with these occurrences is to:-

(a) Establish which individual users of the telephones have problems.
(b) Advise those users not to speak too closely to the mouthpiece as this will exaggerate their difficulty.
(c) If the user is still not satisfied, offer to change their telephone.

A problem has been found when (early model) REACT 320 is used in the following combination of circumstances:
Connected to a TXE4A Electronic or TXK3 Crossbar Exch,
Whilst dialling out in the Hands Free mode,
Telephone is set to LD (Loop Disconnect dialling).
This resulted in Dial Tone being returned or incomplete dialling even though the correct number was displayed on the telephone.

No similar problems have been reported on any other types of public exchange or PBX and the problem does not occur when the telephone is in the MF signalling mode (e.g. on enhanced TXE4A exchanges).

TXK3 exchanges were only found in London, Birmingham, Manchester, Liverpool, Glasgow, Edinburgh and Belfast and are rapidly being replaced. TXE4A exchanges are fairly widespread and being enhanced to offer MF signalling.

React 320 models with serial number 88490015001 (available since January 1989) onwards have been modified to overcome this problem.

The signalling processor in React 120 requires a short period (approx. 500ms) to power up on handset pick-up or after earth recall is used. During this period any MF digits keyed will be of low volume and may cause wrong numbers or incomplete sending.

This will occur with or without batteries fitted and only affects React 120 set to MF (no problem when set to LD). Users reporting this problem should be advised to wait momentarily until dial tone reaches full volume before starting to key any digits.

CSI 183 advises that a power unit (Telephone Adaptor 25) may be required with REACT 320 telephones on DELs with Line Current below 40mA or on PBXs with Line Current below 25mA. This is an in line mains power unit requiring the fitting of a suitable mains plug-top.

The following results of tests carried out by Martlesham with React 320 on various BT switches are intended to enlarge on this.

Power Unit most likely to be required:
Consort, Renown, Ambassador & Senator 2-wire extensions.

Power Unit may be required:
Regent, Kinsman, Viceroy, TSX 50, Monarch, Minimaster 3.

Power Unit not likely to be required:
Pentara, Escort, BTeX/SLI, SX2000, MDX, Navigator.

React 320 is not suitable for use as a 'Power Fail' drop-back terminal on earth calling PBXs where the earth recall button is used to seize the exchange line under mains failure conditions.

This is because React 320 incorporates a semiconductor controlled Earth Recall circuit which requires normal line conditions on both legs of the line.

Taken from BT Customer Service Information notes


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Last revised: July 14, 2022