Audio muting question

[hpierce]

I have a 2003 EB Expy with the NAV system/radio. The question is, Does this system have a muting capability so as to mute the sound when a cell phone call is received? My Nokia Car Kit has a lead for muting, if the radio has a provision for this.

Another angle is if one could acquire the NAV/Radio service manual with wiring diagrams.

Thanks