The long-awaited killer multimedia applications can’t really materialize until today’s stand-alone ATM networks start to get interconnected. That’s where HP’s E4217 NNIB-ISUP Signalling test software comes into the picture—it enables the interconnection of ATM networks by testing the Network-Node Interface (NNI) and Broadband Intercarrier Interface (BICI) signalling protocols that route customer calls and pass on billing, user profile, and equipment capability information.