Phonebook feature not clear/not working
**Describe the bug**
No phonebook switch in Home and Eve.
No resolution of caller id's in callmonitor.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

**Expected behavior**
A clear and concise description of what you expected to happen.

From the docs I understand that I can use an option Phonebook.
I choose this in the config, but don.t know where to look for the switch that is supposed to be generated.
I see call monitor incoming and outgoing in Eve. I can confirm that an incoming call is registered, but I expected caller details.
I suppose the Phonebook option is needed for this ?.

**Screenshots**
If applicable, add screenshots to help explain your problem.

Screen in Eve.

![afbeelding](https://user-images.githubusercontent.com/429386/98945896-7136c600-24f3-11eb-851c-08b34964151c.png)

**Desktop (please complete the following information):**
 - OS: Rpi
 - Version homebridge-fritz-platform v5.0.8 

**Smartphone (please complete the following information):**
 - Device: max XS
 - OS: [e.g. iOS14
 - Browser [e.g. stock browser, safari]
 - Version [e.g. 22]

**Additional context**
Add any other context about the problem here.
