Cisco IDS signature for napster

[rogel.martinez]

We're using the Cisco IDS system, specifically VMS and a IDSM2 module on our 6509 switch, with all the updates. I've been tracking down P2P traffic, and it seems to catch all except for the napster traffic. I've looked through the file sharing sig group to make sure everythings enabled, and I don't see anything for napster. Does anyone know if there's a equivalent signature or any other solution. Any help is appreciated, thanks.

[infinitingr2]

I think that using CSA (Cisco Security Agent) you could block music dowonload. I am not sure if youc an do this using IDS except you create a custome signature