I don't have the kit but I remember this being discussed before and other users reporting the same.
Can't you convert your audio books into MP3 (if not that already) and play them from the PCMCIA interface, there pause would work during a phone call. DVDs would be the same but I find PCMCIA with memory cards more convenient.
I guess it has to be an issue with this older approach for iPod interface where the control is not coming from the head unit and the mute signal does not reach iPod (interface).
Can't you convert your audio books into MP3 (if not that already) and play them from the PCMCIA interface, there pause would work during a phone call. DVDs would be the same but I find PCMCIA with memory cards more convenient.
I guess it has to be an issue with this older approach for iPod interface where the control is not coming from the head unit and the mute signal does not reach iPod (interface).