Blind transfer : press XFR + enter new phone number + press XFR again
Non-blind transfer : press XFR + press line number
All lines that are in conference mode will talk and listen to each other.
Conferences are created in the phone, independent of your PBX.
All 6 lines can be placed in conference mode.
Speaker phone mode is when your not using a headset. The phone will operate in half-duplex mode. When the inbound sound is over the defined threshold, your mic is muted until the inbound sound is lower that the threshold and will remain muted for the defined delay duration, to avoid feedback (echo).