To access your mailbox remotely, you will need to dial your own number and wait for your greeting to begin playing. 

Once your greeting starts, press the * key and the system will ask you for an ID number. Enter your 5 digit extension (ie: 56200) and press the # button. 

The system will now ask for your PIN.  Enter the PIN for your voicemail and press the # button. 

You can now follow the prompts to change settings, update greetings, or hear your voice messages.