Samsung DCS 12 Corded Phone "incoming voice cant hear" Questions

phillips cd 130 outgoing calls distorted and person cant hear my voice very well. incoming calls can be heard clearly Cannot delete 4 saved messages and 2 new messages on my cd130 handset

...power went off and our phones will not ring for incoming calls it sends them to voice mail eventually and we never hear the phone ring, the ringer all is set ok what is the problem and how do i fix ...