Peter,
Firstly, a very warm welcome to Beoworld..
As your three Mark I Beocom 6000 are working correctly, then there is little benefit from a general user viewpoint unless you wish to use the hands free option.
There is in fact three (3) versions of the Beocom 6000:-
- A Mark I version
- An updated Mark I version which provides all the functions of the Mark II including the same software, EXCEPT it does NOT have the earset socket and needs to be charged on a Mark I charger.
- A Mark II version
The key differences between a Mark I and Mark II are:-
- CLI (Caller Line Identification) works in all locations where available, there are some issues with the Mark I on some exchanges
- The Menu is much more user friendly.
- The internal intercom feature is easier to use (my view)
- The conferencing facility
- Display is in upper and lower case text
- 8 different ring tones
- Also different software can be loaded for different countries
Also, if you get a fault on the internal module, you cannot have it replaced, it must be upgraded with a B&O upgrade kit.
Now Andy (Jandyt) will also say that the Mark 1 has over the Mark 2 which nobody seems to notice is the gradually increasing ring tone that wakes you up gently instead of catapulting you out of bed!
With regards to CLI (Caller Line Identification) provided you have paid for this service from your telecom's provider then it works in most countries, however there will be problems on some older exchanges and through some providers. Even in the UK using a UK purchased Beocom 6000 in some areas CLI may not work or not work correctly, particular if the phone line is also used with ADSL (broadband).
As well as the firmware in the Beocom 6000 phones there is also firmware in the base which actually is the more important part to be concerned about when talking about CLI. The Beocom 6000 phones can be at different software versions without problems.