Outbound Caller-ID from SIP device is being ignored

Good night.
Here, ASTPP 6.
Grandstream Endpoint, correctly configured, registering fine; DID assigned to endpoint, incoming calls working OK.
SIP device configuration in ASTPP looks fine, and has a "Caller Number" assigned(eg.: 5554443333)

But, when I make a call from the endpoint, ASTPP is using the Caller-ID from the endpoint, ignoring the assigned "Caller Number" 5554443333 ...

Already double-checked the following parameters:

• Caller-Id-In-From (in Gateway config...tested true and false, same issue)
• Extension-In-Contact (in Gateway config...tested true and false, same issue

In order to confirm the situation, I made changes in the Endpoint(programming in the phone, the Caller-ID my carrier needs to see), and this "trick" works...but I don´t think this is the correct way to solve the issue.

...I don´t know why this happens in version 6...I have working other server(version 5), and the parameters related with Caller-ID are working fine; the endpoint has his own username/CID number, and no matter this, ASTPP5 overwrites and assigns my correct CID programmed in the "SIP device" section... why this issue happens in version 6??..
...or maybe am I doing something wrong?

PS: I have tested in two separated servers both with ASTPP6, one with centOS, the second with Debian...same issue...