Trying to change the display name on a DKT

Hold the DN key while pressing # then 6 then 2 then 1 would be my guess.

do yo mean DND - that would be the Do Not Disturb button - not sure what just DN would be

Press "intercom" button, then #621. Use * to move the cursor all the way to the left. Use the # sign to change from numbers to Alpha. For example: You want "N", but the "M" comes up. Press the "0" to toggle to additional letters on same number key. For a SPACE, use the number 1 and toggle to get a space.

You are on a CTX system and are using the wrong code. On most CTX systems this must be done through the Admin software which is dealer propriety...good luck

iicm #620 or #621 will only work if your system is a DK 14, 40, 40i or 424. If it is a 8,16 or 280 try without the #
You may want to try here http://www.sundance-communications.com/cgi-bin/ultimatebb.cgi?/ubb/forum/f/11.html
for more info.

r u using CTX/CIT system??
this only apply for CTX/CIX
to set extn ket at flexible button
press  #9876
press  HOLD
press the flexible button u wanted to assign
press 610 follow by extn number
press again the plexible button to confirm
repeat step for other flexible button

to set name must go to administrate phone
press MODE at the display
press ADMIN
key in password
default password are ' 0000 '
press HOLD, display will show phone name
press HOLD, again will show DN ID
DN stand for extn
key in extn number then key in name
HOLD again to confirm setting
repeat step for other name

To edit display name on LCD DKT3020-SD.

Follow this sequence:

Mode
Scroll
Enter passwork - 0000 is default
Hold
Hold (again)
DN ID (This is your phone extension #)

Old name should now be displayed. Hit page button to delete letters, scroll button for space.

Use characters for the the associated number key to enter desired name. For example if you want an "F" you would hit the 3 button 3 times. After your name is entered, press hold. Pick up and put down receiver.

By dialing intercom #621 and pressing the * key to move cursor left. press pound changes to letters and 0 is toggle. Your manual and good guides are here
http://guides.idacomusa.com/

wat system using?
find out the adminstrator phone (pic to set the speed dial)
must hv displayed phone.
press MODE will see PHONE　NAME　press　HOLD　display　show　ID　DN　it　means　key　in　extention　number,　after　that　key　in　name,　press　HOLD　to　confirm,　repeat　step　for　other　extention　name
press　MODE　untill　time　appear

Maybe I can help, Press ( DN ) + #621
Display changes to USER NAME ?
Enter new name
Press SPKR

1 - moves right
* - moves left
# - toggles between alpha mode / numeric mode
0 - scrolls the alpha / special characters

To blank out any portion of name press 1 ( in alpha mode ) and move cursor to thr right
Good Luck

I am assuming you want to change the display to read another persons name, or blank. If that is correct:
Press a [DN](labeled intercom on my system) + #621.
That opens edit mode.
an example. My phone reads "MARK 29"
where Mark is the user, 29 the extension. John replaced
Mark, so target is "JOHN 29"
so intercom # 6 2 1 puts me in edit mode
# toggles between alpha/numeric
* moves the cursor, I repeat * until cursor is under M
Hit the 5 key, changes the M to J and moves cursor under the A.
Hit the 6 key, the A changes to M, and the cursor moves to under the R. I hit 0 which changes the M to N. I hit 0 again, the N changes to O.
Hit the 4 key, the R changes to G. Hit 0, G changes to H.
Hit the 6 key, K changes to M. Hit 0, that changes the K to M. Hit 0, M changes to N.
We are done, as the extension number stays the same. Hit spkr key to leave edit mode.
Hope that helps!
# toggles alpha/numeric