XFER and BXFER PSKs are present on connected screen by default (bxfer is on the second screen, use right arrow to switch pages)
XFER to predefined number (including VM) is either not available in SIP mode or not documented feature
Conf PSK is present on connected screen by default as long as you have (at least two) connected calls to join.
PSK can be configuret via WWW UI, see [ Phone ] tab, search for "Programmable Softkeys" on bottom.
Turn "Programmable Softkey Enable" to on and then modify the lists according your wishes. Read Administrator's Guide for syntax description.
Note that particular PSK will not appear, depite ordered by configuration, unless conditions are fulfilled - for example, [ conf ] PSK will not appear unless you have active calls to join. xfer and bxfer will not appear unless call connected (it's not possible to transfer call in ringing state).
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