GitHub - developerspace-samples/VoIP-Call-Sample: An android application that includes ConnectionService binding to handle incoming & outgoing calls. It helps to know the use ConnectionService in Android.
![android - How does "Phone" app show information of contacts that are not on the address book? - Stack Overflow android - How does "Phone" app show information of contacts that are not on the address book? - Stack Overflow](https://i.stack.imgur.com/lDB3h.png)
android - How does "Phone" app show information of contacts that are not on the address book? - Stack Overflow
![android - How to merge Call programmatically while other call is running (Conference call) - Stack Overflow android - How to merge Call programmatically while other call is running (Conference call) - Stack Overflow](https://i.stack.imgur.com/dHjRL.png)