Remote phone book caller id not working & No missed calls logs

[Stefan]

We recently switched to SIP based telephony at our company. We settled on the W52P set, but we've run into several issues:

1. Even though the specifications specifically mention a 500 contact local phone book only the first 100 get stored
2. The remote phone book seems to be able to hold more contacts, but is not used to show names with incoming calls
3. The local phonebook always shows up in the phone menu, even when empty, which is quite impractical
4. The phones didn't work at all before doing an upgrade to the last official firmware, but now no history is shown at all, no missed calls, etc...
   

I've searched and found some of the issues above, but no real solutions. It won't matter to us if we need to use the local or remote phone book, but we do need the 500 contact capacity with working caller id (we bought these phones over alternatives for this feature).
The missing of a log for missed calls is also quite a problem for us.
Can you please advice?

The base station has firmware version 25.50.193.1 and hardware version 25.1.0.0.0.0.0
The handsets are on firmware version 26.50.188.1 and hardware version 26.0.0.7