If you are already on purefibre(assuming you already have an ONT installed) they can just upgrade from their side by changing the profile. There may be some exceptions that I am not aware of.
I think it is a quirk of Panasonic cordless phones. I have seen that happen over the years and there is some Caller ID information on my corded Nortel Vista phone but not on the panasonic. I can't be certain but that is the best explanation I have.
