What to use for building a calling app for API below 23?

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When going through the android docs for building a calling app I saw that I need to implement ConnectionService. However I need to Lollipop and ConnectionService has been added in API 23. I couldn't find alternatives in the framework. Am I missing something? How can I achieve this in older platforms?

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I know this answer is a little late, but it looks like it might not be possible to replace the default dialer before APK-23, as the feature was added in APK-23.

https://medium.com/makingtuenti/android-default-dialer-replacement-part-i-722d05ca50fe