I have a set of BT 4600 cordless phones with answering machine. There are three phones in total but I am only able to use one of them properly. They all ring out and I can answer calls but on two of them no one can hear me I apparently sound as if I am down a tunnel.
Hi @Niucla97 welcome to the community and thanks for posting, have you made sure the batteries are ok in the two phones experiencing this problem? Also if you haven't tried already I'd recommend that you try resetting the handsets back to factory settings.