there are several personal feature keys on the mitel 5324 ip phone.

key 1 published extension number

key 2 call forward always

key 3 multi-call prime extension

key 4 headset (switches from handset to headset)

key 5 voicemail (access for prime extension)

key 7 history (displays last 20 calls)

key 23 calls helpdesk extension 2200

key 24 calls security extension 2002