Go to Yard Sale to buy a phone recorder($1-5). the Walkman with record func is used in such case that even you listen from the phone recorder several times, you still have some confusions (fast speaking or strange accent). How? Record the message on the Walkman--Bring it to a local English speaker (like your ESL/LINC teacher)--Ask him/her listen to the message for you. This is a double assurance way.