1)A signaling gateway converters E1 to E1 with different signaling; 2)converter any signaling among SS7, PRI, Q.SIG, V5.2, R2 ... -AD300D is a cost effective, powerful, reliable and stable signalling converter. Specialty: * Signalling support: ITUT C7, SS7, ISDN PRI, ... x 2048 * Clocking accuracystratum 3 Clock. * Clocking Source from E1 or internal. * Hard ware resource: 256 Voice channels,256 meeting ...