How to show double height green statusbar (In-Call) in foreground app on device?

Question

There's a lot of questions here asking for displaying a red recording bar while in background. It's totally clear I should use AVAudioSession category AVAudioSessionCategoryPlayAndRecord for that. My question is how can I display a green In-Call bar (or at least red bar) in a foreground app when having an active VOIP call in my app? So I could return to call UI tapping a statusbar area, just like Whatsapp or Skype does.

What I've already tried:

• voip and audio modes in UIBackgroundModes key in Info.plist + setCategory:AVAudioSessionCategoryPlayAndRecord + setActive as suggested in this SO answer (gives me a red statusbar when going background, but nothing while in foreground)
• Previous + AVAudioSession + setMode:AVAudioSessionModeVoiceChat - didn't work
• Set kCFStreamNetworkServiceTypeVoIP flag to socket in pjsip sources and recompiled it - didn't help. Also, deprecated since iOS 8.
• Created a separate socket, set the voip flag for inputStream/outputStream: [self.inputStream setProperty:NSStreamNetworkServiceTypeVoIP forKey:NSStreamNetworkServiceType] (took the sample code from here)

Using pjsip for calls. What else can I try to increase a statusbar height, moving all the UI down? Are there any standard ways to do that, or I should hack it my own by resizing a root UIWindow and setting another green UIWindow under the statusbar?

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Edit: Since no answer is found for a standard way to do that, accepted @roman-ermolov answer. For those who will search for an answer I may suggest several options to do it yourself:

1. Wrap your root viewcontroller inside container, like in Apple's iAdSuite with Storyboards example. Take a look at my sample project for example. Probably the best way to make that bar.
2. Hack UINavigationBar height (see this approach) - doesn't work for landscape yet, but may probably be solved
3. Control your main UIWindow's frame yourself, place another UIWindow under the statusbar with the desired content.

Answer 1

I have made an investigation of both apps (WhatsApp & Skype) and learned that they used their own UIView for achieving this functionality.

This is Skype:

This is WhatsApp (Reveal can't get real snapshot, but it transmits basic idea):

In both apps it is a UIView which starts on top of the screen and several methods for format output text / handle touch on it.

In iOS 10 Apple introduced CallKit.framework, but it seems that it has not that kind of functionality too, so the only way to do it - do it yourself.