Panasonic Kx-UT670 BLF

I would appriciate any help. I have connected to sip Phones from Panasonic KX-Ut133 and kx-ut670.
Blf dial nicely on both phones . However, while I can see the extensions status on the 144 blf buttons, I do not get this indication on the 670.
I have seen demos of the ut670 (OnSip) where this function works.
I would appreciate any help.

PS: This is not a Panasonic forum. Please post anything related to Open Source Asterisk IP telephony.