I have a Yealink T28 Firmware version 188.8.131.52. The BLF's are set up for the phones extension in 3CX but the phone displays its own extension for every key. I have also attempted to manually configure them in the phones web interface but it still only shows its own extension. The only other phones I have on the system are polycom ip 550's and they pick them up from 3CX with no issue. Any ideas on why the Yealink is not pulling them up?