Reinventing the dial-up modem (2019)

5 months ago

Developed a healthcare app called Simple to replace paper registers and landline phones for nurse-patient follow-ups.
Implemented phone number masking to protect nurses' privacy by routing calls through a proxy.
Chose an offline-first approach to ensure functionality in areas with poor internet connectivity.
Used DTMF tones to send data to the server without an internet connection.
DTMF tones are played during calls to transmit patient numbers, decoded by Twilio for call routing.
Explored the historical context of DTMF tones with a reference to 'phone phreaking'.
Provided an exercise for readers to test direct dialing with DTMF tones.

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