FortiVoice Dial Local Number Caller ID Change

Forti voice is 7.4.1

Is there a way to mass or change the 4 digit caller ID when doing local calls to other 4 digit extensions?

i.e. I have 2 front Desk Phones both have Primary Extension (Main Phone and Aux Phone) 1234 and then have the Departments line 4444 has a SLA.

When they call from these phones to just a 4 digit internal extension Caller ID shows ‘Desk Phone 1234’, I would like to hide the 1234 and just have Desk Phone show up, since everyone knows to just call 4444 locally to get to the front desk. Having 1234 show up can be confusing. 

I cant make the 2 desk phones just 4444 because placing calls on hold doesn't show up on AUX phones or any other phones that might also have that SLA mapped. 

We also plan to always have call forwarding enabled on 1234 to 4444, but I still would like to completely hide the number if possible.