on my Pioneer D1, when a call is placed or recieved the unit mutes the radio/cd you are listening to at the time and goes to phone/onstar.
As for numbers showing up i'm not sure... cause my stock radio the numbers never showed either, so it could be a difference with the moonson system vs the regular.
either way, you'll need to pick up the onstar module which you can find at any local stereo shop.
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