Modification to Ccir decoding to capture bespoke code used by NZ Fire Service

[dionma2020]

Hello

can anyone assist with modifying the CCIR decoder to accurately detect a bespoke code that NZ fire service use?

CCIR tone frequencies and corresponding symbols

tones = {
1981: '0', 1124: '1', 1197: '2', 1275: '3', 1358: '4',
1446: '5', 1540: '6', 1640: '7', 1747: '8', 1860: '9',
2400: 'A', 930: 'B', 2247: 'C', 991: 'D', 2110: '+REPEAT', 1055: 'F'

Tone duration appears to be between 20 and 100ms.

Many thanks.