If you are talking about the Garmin GTR 200 radio, have a look at the GTR 200 Pilot Guide Rev C Page 9. There you will see a menu setting for Com ICS Mute. When set to "On", intercom communications will be muted during received radio calls.
FYI ... there is also a menu setting that does the exact thing for music called Com Mute Music. Here again "On" will mute music during a received radio call.
If it is not a GTR 200 radio, I would expect similar options on other radios.
I don't think there is any right or wrong way to set these options ... it is purely pilot preference. My preference is to mute all distractions when receiving radio calls.
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Last edited by John-G : 11-05-2018 at 09:31 AM.