[Merge] lp:~boiko/telephony-service/test_tone_generator into lp:telephony-service

[Tiago Salem Herrmann]

Review: Approve

Looks good.

--checklist--
Did you perform an exploratory manual test run of the code change and any related functionality on device or emulator?
Yes

Did CI run pass? If not, please explain why.
No, not related to the changes

Have you checked that submitter has accurately filled out the submitter checklist and has taken no shortcut?
Yes
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https://code.launchpad.net/~boiko/telephony-service/test_tone_generator/+merge/256573
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