First can I ask you not to flood the forum with multiple posts about the same subject as this may annoy members who subscribe to all forums?
One post wil be sufficient as we will be notified about any new messages regardless of which forum it is posted to
What is your Comfort firmware version
You can use Comfigurator and do Transfer > System Information, or if you do not have a UCM, read the label on the Comfort panel U1 IC eg ULT 5.123, OPT 5.200
Is there voice on the keypad at all? eg when you enter the use code and go into user menu do you hear the voice menu? Or you can press F5 to hear the event log? Is there any events announced
If the voice is lost it may have this effect. In this case Upgrade the vocabulary using the UCM and Comfiguratoro 3.4.0, see the instructions at http://www.comfortforums.com/forum76/1623.html and read the section of the UCM manual which gives the instructions