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

Ask Time：2018-11-15T19:04:45 Author：dephinera

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?

Author:dephinera，eproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/53318056/what-to-use-for-building-a-calling-app-for-api-below-23

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