Ericsson F251m User Manual page 20

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Otherwise, you can alternatively dial each of the following
sequences and check each time if the numbers appear on your
CLI display by conducting the "Ring Back Test" after a
specific sequence is dialed. You should find that one of the
three sequences allows you to visualize the number
"1234567890" on your display when the "Ring Back Test" is
conducted.
CLI standard
ETSI DTMF
ETSI V.23
Bellcore
In order to disable the CLI Display functionality (not to see
CLI information anymore), dial **000*0# from a DTMF
(Pulses) telephone connected to the FCT.
Tip: if you do not want your telephone number to appear at the
caller's location, you can dial the #31# before the phone
number you are going to call (B-number) (#31#B-Number)
To find out about the DA20 Display accessory, please check
"FCT accessories" on page 41.
Dialing sequence
**000*1#
**000*2#
**000*3#