I am struggling to get blf working on a Cisco 9971. It runs a SIP image (the latest, currently). Most other features (call lists, directories, caller id, …) run fine as I can tell.

I just can’t get the phone to display blf status properly :-(

I followed the hints here: 

and learned a lot of xml config here:

basically, both above source say, I should configure a <line> with <featureID>21</featureID>, and set <featureOptionMask> to 1.

But that doesn’t do the trick yet - the first link is for asterisk, and it says a „hint“ has to be configured as well as a „subscribe“ entry in asterisk.

Do I need to do anything else somewhere in the freeswitch config?

I admit, I am a bit lost here…

Regards,

Thomas