sip.cfg
    <digitmap dialplan.digitmap="1[2-9]xxxxxxxxxT|[2-9]xxxxxxT|[2-9]xxxxxxxxxT|08xxT|8xxT|7xxT|[1-3]T" dialplan.digitmap.timeOut="3|3|3|3|3|3|3" />

mac-phone.cfg (after </msg>)
<efk>
        <version efk.version="2" />
        <efklist
                efk.efklist.1.mname="callpark"
                efk.efklist.1.status="1"
                efk.efklist.1.label="Call Park"
                efk.efklist.1.use.active="1"
                efk.efklist.1.action.string="#700"
                efk.efklist.1.action.string="$FTransfer$$FDialpad7$$FDialpad0$$FDialpad0$$FDialpadPound$$Cp3$$Chu$"
        />

 <efkprompt
                efk.efkprompt.1.status="1"
                efk.efkprompt.1.label="Extension: "
                efk.efkprompt.1.userfeedback="visible"
                efk.efkprompt.1.type="numeric"
        />
</efk>
<softkey
        softkey.feature.newcall="1"
        softkey.feature.endcall="0"
        softkey.feature.split="1"
        softkey.feature.join="1"
        softkey.feature.forward="1"
        softkey.feature.callers="1"
        softkey.feature.mystatus="1"
        softkey.feature.buddies="1"
        softkey.feature.basicCallManagement.redundant="0"
        softkey.1.label="Park"
        softkey.1.action="!callpark"
        softkey.1.enable="1"
        softkey.1.precede="1"
        softkey.1.use.active="1"
/>