add contact to remote directory via phone

[adriaand@emalangenitech.co.za]

Good day all

A client ask me if he / she can add new contacts to the remote directory (not local). I have it that you can't do it.

Or I can be wrong.
I am not sure doing it through LDAP, or Google Contacts.

The Client is using T54 phones .

Any advice of someone that could have gotten something right.

I Know if you have a pbx like 3cx , you can use it to add it that way around.
however the pbx they are using does not have that facilities .

Kind regards