Self Contained Payphones.

iNFERNO oF MED&eLTECH

The following is from an aging BT document on Payphone on-site maintenance,
the document is fairly old to it may not be that relevant today..

CODE FUNCTION OF TEST

Operational Tones

07 400 Hz Coin Tone
08 800 Hz Identification Tone
09 1200 Hz Identification Tone
10 400 Hz Warning Tone
11 400 Hz Coin Tone (Reciever short circuit)

MF 4 Tones

12 679 Hz Reciever Short Circuit
13 770 Hz ``
14 852 Hz ``
15 941 Hz ``
16 1209 Hz ``
17 1336 Hz ``
18 1477 Hz ``
19 1633 Hz ``

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