voice output is not working

all the functions are ok but only voice output is not working..when i speak the other one can hear me but when he speaks i can not hear.. calling belland the buttons bell are not working either

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0