ps561 voice dialer does not dial out

[bck]

 I bought the whole x 10 package everything works great but the dialer does not work. x 10 sent me a new one it worked somewhat . but it would only dial out two of the four #'s. now it will not dial out at all. i do have a digital phone. through my cable company. is this my problem. I told x 10 i had a digital phone through my cable company. any suggestions  thanks in advance