This is interesting as I have a similar issue with my Windows Phone. No sounds on incoming txt messages and the txt to voice function of the phone doesn't work. The only time it does is if I happen to be initiating or ending a call and a txt message comes in at that time. So basically when the voice channel is open for another reason.
I've never considered the media player component so I'll see if I have any options. I think Windows Phone just connects both as well.
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