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There are two possible options. For European Radios, they don't use Onstar, they use another module. You would need to get the low speed module add in some custom wiring and somehow have the radio reprogrammed to use this Module.
The alternative and probably much easier way is use a hands free kit. This is not guaranteed to work but probably will. Pin 13 (-) and pin 20 (+) on the radio are the same inputs used by Onstar. Pin 15 (Mute) should mute the audio and switch it to whatever sound is coming in through - and + regardless of how the radio is set up. You would basically need some kind of hands free kit that could ground a wire when a call is taking place.
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