Toyota 2012 Avalon Owner's Manual page 304

3-4. Using the hands-free system (for cellular phone)
■
Call history
Up to 5 numbers can be stored in each of the outgoing and incoming history
memories.
■
When talking on the phone
●
Do not talk simultaneously with the other party.
●
Keep the volume of the receiving voice down. Otherwise, voice echo will
increase.
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