Hola! > Any word on what do you use? Other softswitch with libss7 or any > custom (your own) softswitch implementation? A custom implementation. It handles ISUP (using libss7) and ISDN NFAS (using libpri) The E1s that don't include signalling go directly to the Cisco AS5400s that we use as media gateways. Saludos, -- Horacio J. Pe?a horape at compendium.com.ar horape at uninet.edu