# Using DTMF tones to route phone calls offline in the Simple healthcare app

DevFeed: [Using DTMF tones to route phone calls offline in the Simple healthcare app](<https://devfeed.tech/articles/reinventing-the-dial-up-modem-29024.md>)

Original publisher: [Read original article](<https://saket.me/dtmf-tones/>)

Author: Saket Narayan

Published: 2019-08-18T00:55:04Z

Content type: article

Language: en

Sources: [Saket Narayan](<https://devfeed.tech/sources/saket-narayan.md>)

Topics: [App](<https://devfeed.tech/topics/app.md>), [Android](<https://devfeed.tech/topics/android.md>), [Internet](<https://devfeed.tech/topics/internet.md>), [data](<https://devfeed.tech/topics/data.md>)

Tags: [android](<https://devfeed.tech/tags/android.md>), [app](<https://devfeed.tech/tags/app.md>), [communication](<https://devfeed.tech/tags/communication.md>), [data](<https://devfeed.tech/tags/data.md>), [decoding](<https://devfeed.tech/tags/decoding.md>), [dtmf](<https://devfeed.tech/tags/dtmf.md>), [offline-first](<https://devfeed.tech/tags/offline-first.md>), [proxy](<https://devfeed.tech/tags/proxy.md>), [simple](<https://devfeed.tech/tags/simple.md>), [technology](<https://devfeed.tech/tags/technology.md>)

## AI overview

The article explains how the Simple healthcare app used DTMF tones to send a patient's phone number to a server during calls, enabling phone-number masking and offline-first operation when internet access was unavailable.

## Source excerpt

While working on a healthcare app called Simple at my previous company, we wanted to improve how nurses follow up with their patients. The aim was to replace traditional paper registers + landline phones with the app, which could intelligently suggest patients who are potentially at risk based on their medical history, age, and other [...] The post Reinventing the dial-up modem appeared first on Saket Narayan.