[phone-app] is stuck on "calling" screen every other call

Steps to reproduce:

1. Open phone app
2. Call device, an incoming call snap decision appears on screen
3. Accept the call
4. View switches to active call screen
5. Hang up after a few seconds and wait until view switches back to the main keypad
6. Call the device again
7. An incoming call snap decision appears again, accept the call

Actual result:
The view doesn't switch to the active call anymore, only the indicator bar states that there is an active call going on.
If you tap on the indicator bar, view navigates to the active call screen but it is stuck on the CALLING screen. The screen is not responsive and it is not possible to hang up the call. Hang up the device you called from and navigate back to the keypad via the BACK button in the header (this works!). Alternatively kill the app and repeat all steps again.

Expected result - desired solution:
If you are in the phone, receiving a call & accepting it - the view should always switch automatically to the active call screen. The screen should say CONNECTING and not DIALLING/CALLING. After connection is established, the usual active call screen should be visible.

P.S.: if you navigated BACK from the frozen screen and call the device again, it will most likely switch to the active call screen. If you hang up and call the device for the 4th time, it will be stuck again. Therefor every other call in the description.