Kyocera 3250 User Manual page 45

The new T2T or cellular call now becomes the active call, and the
original T2T or cellular call is placed on hold.
Make a T2T or cellular call.
Due to technical constraints, you cannot toggle between the two calls
using
Ask the party on the new call placed to hang up when finished talking.
Your phone returns to your original cellular or T2T call.
There are times when you will be engaged in a T2T call (using the
speakerphone) that you receive a "Call Waiting" call. Or, times when you
are engaged in a cellular call (using the earpiece) when a T2T "Call
Waiting" call comes in.
In all call situations the call waiting tone is played using the speaker and
volume level that matches the initial active call. For example, when you are
User Guide for the Kyocera 3250 phone
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