If you have a Samsung iDCS 28D phone system and would like to change the main greeting, there are a few steps you'll need to follow. First, access the voicemail box of the user whose greeting you wish to change. To do this, press *98 from any handset on your system. This will prompt you for the mailbox number-enter the extension of the user whose greeting you'd like to change, then press #. Next, enter the password for that mailbox (the default password is 6789), then press # again.
Now that you're in the voicemail box of the user whose greeting you'd like to change, simply press 4 for Personal Options, then 2 for Record Name. You will be prompted to record your name-speak clearly into the handset after pressing # when prompted, then hang up when finished recording. Your new name will now be played back as part of that user's outgoing message!