No sound from handset Speakers (note not "loudspeakers)

Here is my problem: when I call someone, I can speak and can be heard but I can't hear the waiting ring tone before the person take the call neither what the person is saying. I can only do so if I turn on the loudspeaker or put the headphones.
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What can I do to solve this? I tried to turn off the phone, take off the battery but it didn't work.
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Can someone help me, please?
Thank you in advance for considering my problem.

from ma awesome BB Q10SQN100-3/10.3.1.2576