Hey there,
You should seriously chat to your boss about situations such as the one mentioned above...I have been very fortunate because our company relies on text and emails. However, I have noticed that because our company is even more deaf-aware since I joined, a lot of people pass the message to me!
Often, I end up telling hearing people what the message was...which is a great irony, but it does happen!
I always believe its our fundamental human right to ensure that all communication is fair and just...fight for your right!
I know everyone in this forum is behind you!!