Speaker Phone Mode does not work on Galaxy Note 1 (N7000)

[usuraj]

I am unable to get the speakerphone to work on my wife's Galaxy Note. The person on the other end is unable to hear the voice but she is able to hear it fine. Had this problem with ICS and also with the recently updated Jelly Bean 4.1.2. Speaker works fine while playing music or any other media files. Could anyone suggest a solution for this? tried to Google the info but could not find a solution.