I believe this applies to devices like the DX650, an Android-based device which can have a screen-lock and password configured:
So maybe it is not AXL channel with CUCM.
I know that The telepresence EX/SX/DX have their own API package.
And you should make API request direct to the device.
Walid, please let us know what is the phone type and model?
I was mainly studying the APIs to determine what calls can be useful to be utilized in our application. The application is concerned with locking phones in general and particularly locking 79XX, 99XX, etc.
Now when I came across this call it was not clear to me what exactly it does and whether it does this natively. Here is the link for it in the schema: https://developer.cisco.com/media/axl-schema-10-0/AXLSoap_lockPhone.html