Phone call active but no navigation prompts

[Deepjoy22]

Although I've had the car for 9 months, I only noticed today that when I'm on a bluetooth handsfree call, the voice messages from the Navigation system appear to be muted.  This doesn't happen when using audio where Nav talks over the radio (depending on the respective volume settings). 

The volume of the Nav system was set correctly but during the 10/15 minutes of the call Nav said nothing even though there were turning / junctions on the route.

Is this standard - or have I missed a setting.  I've spent an hour looking at the various manuals but can't find a particular mention of this.

Thanks.

[xtrailman]

I believe it is.

Another missing feature on the MZD version is the facility to push the screen to get the instructions early or again. Infact theres very few features you can customise.