Phonebook on SSL-Server

Hi @ all,
I'm sorry for my english.

I'm a new user on Yealink (t48g) phones.

I try to configure a remote phonebook on our server with connect to our crm.

I created XML demo files and it works fine on http (without ssl), but on ssl
it doesn't works. There are no entries in the server log if try to connect with ssl.

With SSL I click the Softbutton (Phonebook), then I select the remote phonebook
and get an error with the message it is not possible to load the phonebook.

SSL on our production server works fine, also tested with Qualys SSL Labs.

Does the t48g support ssl for remote phonebooks?

Can anybody help me? Https without ssl is no option for us.