Hi i also have one of those in my Trophy great bit of kit and very easy to fit.
All the power cables and the earth were fitted to the Headunit wiring loom and run down to the centre console where the main control box is tucked down by the carpet on the passanger side.
With regards to the main control unit with the volume and answer functions, i have fitted mine near the steering wheel between the split in the dash board, which is a really nice place to fit it as it is out of the way but easy to reach.
The speaker was simple as well, i ran the cable under the carpet over to the passanger side near the bonnet release. There is a metal bracket that i cable tied the speaker too, again nice and neat and out of the way.
The mic was placed next to the light on the roof, again i ran the cable under the carpet this time under the drivers side, took the door sills away from the car and ran it through the headlining at the top of the windscreen.
With regards to the tel mute on the std h/unit on the black connector on the wiring loom you will see they are numbered, you need to splice track no 3 which is the TEL Mute.
Hope this helps, if you need anymore infor PM Me of catch me on
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