Help! About MusicOnHold- asterisk

Hi guys, please help me how to Play MusicOnHold(classic) when i finish to talk with someone in my context [internal]
I mean, for example, that when i call to 221@internal,ok then i hangup because i finished to talk, so How can i Play on speaker of my Linksys SPA942 the MusicOnHold(classic) I know i can do this using DeadAGI() but i don’t know how to, please write the .agi code to do this.
Thanks a lot!
Manuel