Configuring a Samsung ITP 5121 IP telephone.
 
You must access the ITP 5121 telephone menu screen to set the information required for the phone to log into the Samsung phone system. While applying power to the phone press and hold the menu key until you see !!BOOT SETUP MENU!!.
 
Press 1 on the telephone key [...]

To get the most out of your voice mail it’s important that you properly set up your personal mailbox.
STEP 1: Record your mailbox greetings

Press the voice mail button on your phone and enter your password (0 0 0 0 by default). Press 5 from the mailbox menu.
Press 1 to assign your no answer greeting
Press [...]

Start by leaving your phone on the hook and press the TRANSFER key.
You should see PROGRAMMING MODE and ENTER PROGRAM ID:
Press 104
If there is a name currently on the display press HOLD to clear it.
Enter the new name by using the key pad, example: for the letter “C” press 2 three times. Use the volume [...]

To change the time and date on a Samsung iDCS100, OfficeServ 7100, OfficeServ 100, OfficeServ 7200, OfficeServ 7400, iDCS500, 50si, DS616 and iDCS16 you must first log into admin programming:

Leave the handset down and press Transfer 200
Enter the pass code (1 2 3 4 by default)
Press 1 and then Speaker

Once you are in programming mode [...]