BLF feature - T29G v.46.80.0.95 wont work

Hi,

We have T29G with
Firmware Version 46.80.0.95
Hardware Version 46.0.0.128.0.0.0

The BLF Feature does not work.

I already read this http://support.yealink.com/faq/faqInfo?id=264 and http://forum.yealink.com/forum/showthrea...e=threaded but it still not working.

We tested Blf in T22P model and it works. But in T29G. it wont