Subaru 2009 Impreza Navigation System - Manual (Page 179)

Handsfree 179
Before using the Handsfree
Phone voice
After making a phone call or having a phone call, you can talk
over the phone through mike and speaker.
• An incoming call notice and a voice output while in the phone call
are output from the speaker on the driver's seat side and passenger’s
seat.
• When a voice or an incoming call signal is issued by the handsfree,
the sound from the audio and the navigation system is muted.