Sound not work in transfer

Then i transfer a call from asterisk Callsound not working anymore…
Should it be that way or do i missing or write wrong?
Call is ok, both can here sound “startsound”.
Why cant they talk together??

timeleft=990000;
phonenumber=*;
tfntocallout=
;
Dial(SIP/${phonenumber}@${tfntocallout},60,G(tomycontext|s|1)L(${timeleft}));

context tomycontext{
s => {
answer();
NoOp(START);
Playback(promts/startsound);
NoOp(FINISH);
wait(1000);

}
}

Anyone who knew how it can be done?

check if you have charged the musiconhold module

musiconhold is woring correct.
Should i do some extra in my code above?