Check the Ringer Switch on the side of the base. If it is set to "Off," you won't hear incoming calls.
Lift the handset. You should hear a clear dial tone. 2. Key Features and Controls Vtech Cd111a User Manual
If you want, I can:
If you need to ask a question on a site like Reddit, Fixya, or a tech forum, copy and paste the text below. This format ensures you get the right help quickly. Check the Ringer Switch on the side of the base
key will cut off the microphone so the other party cannot hear you, while still letting you hear them. Flash (Call Waiting): or a tech forum