You stated this in another thread. I didn’t want to hijack that thread so I reposted this here.
What version of Asterisk did you install?
I am currently running Asterisk 220.127.116.11 and use the Aastra 6757’s with BLF’s. I tried to upgrade to 18.104.22.168 and BLF’s quit working for call pickups. I then reverted back to my old setup and haven’t chased it since then. My next attempt will probably be with a 1.8 version.