[asterisk-users] Customisable In-band ringing?

[Ray Jackson]

All,

Using SIP with progressinband=yes I get Asterisk to generate the ringing 
sound for callers.  However, I was wondering if it is possible to 
configure what is 'played back' to the calling party?  i.e. instead of 
just 'ring ring' could I potentially play back a song from an MP3, WAV 
or GSM file?  I'm thinking it would be quite cool to offer a customised 
'ring' sound while the caller is waiting for you to pick up?  How can I 
do this with Asterisk or some external module perhaps?  Any advice welcome!

Cheers,
Ray