There are two possible answers to this problem. The first thing is to check on the cordless phones, is a 2 way switch, one setting is for DP=Dial pulse (setting for old rotary phones) 2nd setting is TT= Touch Tone. I would guess that the setting should be set to TT on both cordless phones for touchtone.
Second thing to do is to plug in the base unit of your cordless phone to a jack that currently has a landline phone plugged into it that works and test again. If cordless phone works OK then go back to the original jack that didn't work and reverse the wires in the jack: that is what is known as a "polarity" issue.
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