Fixed core bug wrt to uninitialized time values of timeouts

darcs-hash:20090529101940-58103-d5c9d41efd1939937912f1822731a4e28935f034
Play on hold tone also when call is taken out of hold

darcs-hash:20090529112735-58103-ecb58a1ad0c31218d5dfc571ae71e35cfb77c264