Remote Phonebook XML version, http(s)

[ssstofff]

Hi guys

In your manual "Instructions on the XML phonebook of Yealink phones", you point in point 1.Overview to the version v41, v42, v43, v50 to know for example you can use http or https.



After debugging on a T42 I found out it is only working with http, and not https.
How or where can I know what version the phone is using? And how to upgrade it to a version where HTTPS is allowed (higher than V41 thus)?

Thx,
Kristof