Ntl d1102

Question

i have 3 ntl cordless phones and a base station i have somehow seemed to have switched them from digital to analogue so when i dial it now sounds like it is going through an old fashioned telephone exchange. Also when i dial any companies etc and the message is press1 for this or press2 for that etc i can no longer do this!!! think i need to get them back to factory settings but have lost the manual....help !!!!!