Polycom VVX 400 - Force BLF only on Side Cards

Hi All,

I am using a VVX400 on

SIP Version 5.3.0.12074 and P/N 3150-11530-530 

Boot BLock : 3.0.4.0006 (46157-002)

BootL1: 1.0.0.0001 (46157-002)

Updater : 5.5.0.13251

The Hosted PBX is Broadsoft and I configure the BLF using blf uri subscription from the platform and controlled via config files. 

As of now when i have 15 BLFs on the phone, i have 10 lines used on phone for BLF and the rest go on to Side car.  

I have got a customer asking if we can just use the Sidecard  for all BLF and leave the Line keys on phone empty.

Could you please confirm if this is possible.?

I did check the link below but it is valid only if you want to manually configure the BLF either on the phone or via the config file using lineKey.reassignment.enabled="1"

http://community.polycom.com/t5/VoIP/FAQ-Can-I-change-re-assign-the-appearance-of-Line-BLF-Speed-Dial/td-p/8578