Ok, the IIA subs use a different CE voice than the VIIB. I guess the VIIB uses voicepack 1 because I'm experiencing the same thing when I enter a IIA in single player missions. I do know it works for my VIIB in the career I am in.
So, for now just use a VIIB if you want to hear the telegraph work (in the limited functioning VIIB Demo
). Otherwise you will have to wait until I finish all the German voice packs to experience it in the other uboats.
I'll get working later tonight to hopefully shut all you non-VIIB users up.