Send Call Direct to Voicemail:

*nnn: Select transfer button, dial * + extension you are trying to transfer to voicemail.  

Call Parking:

*270: Attended Transfer call to the Parking Lot Extension. The lot number will be announced to the parker
*275: Attended transfer to lot 75
*2nn: Attended Transfer call into Park lot nn
70: Park Yourself. The lot number will be announced to you
75: Park Yourself into lot 75
nn: Park Yourself into lot nn

Paging & Intercom:

*80nnn: Intercom extension nnn
*54: Enable all extensions to intercom you (except those explicityly denied)
*54nnn: Explicitly allow extennsion nnnn to intercom you (even if others are disabled)
*55: Disable all extensions from intercom you (except those explicitly allowed)
*55nnn: Explicitly deny extension nnn to intercom you (even if generally enabled)