Add support for receiving DTMF tones

[mickel8]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.33%. Comparing base (af0ab87) to head (8e727ea).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #215   +/-   ##
=======================================
  Coverage   88.33%   88.33%           
=======================================
  Files          49       49           
  Lines        2598     2598           
=======================================
  Hits         2295     2295           
  Misses        303      303           

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