A-Lu unique advantages (features) over other vendors

[Puno]

Also what about the qwerty/azerty keyboard for dial by name afaik this is unique

Yes! And using this keyboard for mini-messaging

[krzysioD]

That should over any ALU to ALU OXE pbx by means of prococol >= ISDN (DSS1) if your telco does not cut USS.
Nice thing: you know that your colleague has a4400, you call him, well, he is not in the office, so you send him 16 chars 'sms'-like message 'call me back' or 'client has signed the order'...