Voice control is a module that piggy backs onto the analogue radio in the boot in the media rack. You can look at photos of it on ebay and see if you can see it in the media rack. It looks like a big silver heatsink.
I don't know about the telephone, I wonder if it is coded incorrectly or the incorrect telephone type has been coded/listed in the CAN Gateway?
If the MOST bus is broken, it does stop everything on the bus working and they usually make clicking sounds like a relay. It even breaks it if you power down a module. If you unplug the connector it breaks the bus too.
It sounds as though your module is powered up but not working on CANbus or something like that.
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