Open Source Pulse to Tone converter

Description

Open Source Pulse to Tone converter
All credits to:
Christoph Tack
Project details can be found at:
https://hackaday.io/project/28557-pulse-to-tone-converter
Description:
Allows the use of rotary (Pulse) phones with modern VOIP equipment.  Converts rotary pulses into DTMF tones.
Hardware design and software code are fully documented at
https://hackaday.io/project/28557-pulse-to-tone-converter
https://github.com/LieBtrau/pulse-dtmf-converter
https://github.com/LieBtrau/pulse-dtmf-converter/releases
https://easyeda.com/LieBtrau/New_Project-06f8d9abfb004e898edb54cca7790566
Case is repurposed from DSL line splitter and markings are not accurate.  See usage below.
Connections:
1) Plug phone line into port labeled Phone
2) Plug rotary phone into port labeled Line
3) Optional: Plug normal Touch Tone phone into port labeled Modem
Placing a call:
1) Lift handset
2) Using rotary phone dial number as normal
3) ~2 seconds after last digit is dialed DTMF tones will be heard
4) If number is correct receiving phone will ring
5) Hang-up handset once call is complete
Limitations:
DTMF codes for * and # are not supported.
Kit Form:
If desired, item can be provided as a kit for you to solder.  Please note that almost all components are surface mount devices which requires SMD soldering equipment.
If ordered in kit form ATTINY85 processor will be pre-programmed with required firmware.