Hi,
I find this behaviour very confusing too.
Huawei P20 Pro with Android 8.1.0
Step 1: Open Zoiper Beta
Step 2: Initiate an output call
Step 3: Observe the in-call screen.
Step 4: Press home.
Step 5: Observe home screen; you are still talking
Step 6: Tap on Zoiper icon again
Step 7: You are back at the main Zoiper screen - you are still in a call but where is it??
Step 8: Slide down the notofocations
Step 9: see a notification showing ZoiperBeta it says:
ZoiperBeta v
*26 (*26) Ongoing call
ZoiperBeta Telviva 2262 registered
Step 10: tap on the notification
Step 11: Observe the Zoiper idle screen. We're still in a call but STILL, where is it?
Step 12: Pull down the notification again.
Step 13: Eventually realise that the downward pointing arrow means something and tap on it
Step 14: Observe the Zoiper notification split into two sections. One refers to the ongoing call, the other to the idle screen. Its kinda like two programs running at once.
Step 15: tap on the top one - the Ongoing call one - and at last we find our call again.
I also really do not understand why Zoiper is built this way. It is really counterintuitive for me and makes it hard to accomplish the simple task of consulting another app whilst on a call and then returning to the call.
Regards,
Steve