InterhackerspacePBX/Payphone

The Payphone is a British Telecom Payphone 300

Internally its missing the main logic board and the cash box

Conversion Plan

Pi + usb audio and a sip softphone

Its expected the keypad it a standard matrix style that we can connect directly to the pin or via a ATMega chip

LCD looks to be a 7 segment style, 4 digits

There are 4 connections internal details of the pins outs can be found below

Pin	Colour	Function	Detail
1	Brown	LCD
2	Red	LCD
3	Orange	LCD
4	Yellow	LCD
5	Green	LCD
6	Blue	LCD
7	Purple	LCD
8	Grey	LCD
9	White	LCD
10	Black	LCD
11	Brown	LCD
12	Red	LCD
13	Orange	LCD
14	Yellow	LCD
15	green	Keypad	Row 3 (PL1)
16	Blue	Keypad	Col 2 (PL2)
17	Purple	Keypad	Row 0 (PL3)
18	Grey	Keypad	Col 1 (PL4)
19	White	Keypad	Row 1 (PL5)
20	Black	Keypad	Row 2 (PL6)
21	Brown	Keypad	Col 0 (PL7)
22	Red	Spare	N/C
23	Orange	Hook
24	Yellow	Hook
25	green	Follow
26	Blue	Follow
27	Purple	Speaker
28	Grey	Speaker	Positive (I think 'RepRap' Matt)
29	White	Spare	N/C
30	Black	Spare	N/C
31	Brown	Spare	N/C
32	Red	Spare	N/C
33	Orange	Spare	N/C
34	Yellow	Spare	N/C

The hook switch state is:

This connector is keyed, Pin 2 is blocked out

Pin	Colour	Function
1	Red	Speaker
2	N/A	Key
3	Blue	Mic
4	Green	Speaker
5	White	Mic

10 pin TBD

14 pin TBD