SBK-128 is a Remote SIM Bank with 128 sims Can connect with serial MV-37X (Support GSM(2G) / UMTS(3G) VoIP Gateway both) via internet. Connect with PORTech GSM Gateway via internet SIM cards no longer need to be installed in GSM Gateway anymore You can deploy your VoIP GSM Gateway in different locations. Centralize and supervise all SIMs in one place (MV-37X-CDMA version doesn’t support remote SIM feature)