I think this is due to having automatic answer enabled. It seems to take a few rings before you here it through the RX's speakers. If you have auto answer with handsfree enabled in the phone it answers after one ring and therefore you don't here the ring tone through the speakers.
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It seems to work actually. The first phone I tried was an O2 Mini - Pocket PC phone. For some odd reason when you receive a call, the ring tone woudn't reproduce through the ML speakers.
I now have a nokia 6820 and wouldn't you know, the ring tone came through the ML speakers. Damian, you are right though.. it takes 1 or 2 rings on the phone before it actually rings through the ML speakers.
Anyway.. thanks for your reply.
Rob