I have programmed the speed dials for the phone system but I am unable to use them from T7453 phone. I have enabled this option on the phone but no luck.

Any help would be appreciated.

Are you referring to system speed dials or station speed dials?
for system speed dial, press intercom, autodial, and the 3 digit code for where that speed dial is stored.
did you put a "9" in front of the number when you stored it?
If it's station speed dial press intercom, 3 *
and 1-9

Thank you. That work!

I did not realize that you needed to hit the intercom button. I looked in all of the manuals and I did not see it. All of the manuals do not reference T7453 phones.

to use dial by name for speed
with display showing ring and BGM press shift key once, leave in that display mode, with phone idle turn the round dial 1 or more clicks, this brings up the SD list by name, turn the dial to the name you want then press the Call soft key or Speaker.
To jump to the K listings press the 5 key twice, then scroll to listing etc.