T46G BLF Keys Issue

[blueadmin]

I have the same issue on an installation with 3CX and firmware of both 28.71.0.224 and 28.73.0.48. Any progress on this one? Happens only on this installation and i have others with same 3CX version and same firmware. I modify the provisioning file with the following changes:
 voice.headset_send = 20
 voice.ring_vol= 4
 network.vlan.internet_port_enable = 0
 network.vlan.internet_port_vid = xx
 auto_provision.mode = 0
 transfer.dsskey_deal_type = 1
 security.user_password = admin:xxxxxx
 features.call_completion_enable = 1
 features.intercom.allow = 1
 features.remote_phonebook.enable = 1
 phone_setting.ring_type = Resource:Ring3.wav - To give distinctive ring for internal calls
 phone_setting.inter_digit_time = 2
 phone_setting.active_backlight_level = 7
 phone_setting.inactive_backlight_level = 3
 phone_setting.backlight_time = 0
 distinctive_ring_tones.alert_info.6.ringer = 1
 account.1.outbound_proxy_enable = 0