You need to verify in the configuration if you have assigned the directory number for this phone: Check the mac address fo the phone to see on which ephone it is registered.
Ex:
Ephone-dn 1
number 1111
ephone 1
button 1:1 /* If the phone is registered as ephone 1 if ht ephone is registered as ephone 2 button should be assigned ont hat ephone
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