Dahua Intercom Customization? Any ideas?

Can anyone help build a soundfile which only rings at the beginning then quiet for 30 sec. I am not that great in hacking firmware and don't want to kill the device.

Concerning the question about the Light on the name tag. You can disable it in the web interface (it is called sensor reduce it and it wont turn on so easy)
 
So changing the ringtone is not possible with the web interface, it's strange no?
Everybody in the world with a dahua VTO as the same ringtone, :oops: