[cisco-voip] Change Audio for Call-Waiting Beep CUCM 5.x

[Christian End]

Hello,
is there a way to change the audio beep for call-waiting?? I mean that i 
want to change the beep tone with another tone like a drum or something 
else...

The background is that i want to have a louder signal when a second call 
is incoming on a 7921 wireless phone. It is fine that it is displayed on 
the phone but the short beep is not loud enough and to short....

Thanks for your help!!!
Christian