1)a 16 E1 signalling gateway; 2)16 digital trunking E1 access; 3)Signalling support:SS7, PRI, Q.SIG, R2, ... maximum 16 digital trunking E1 access.In the signalling conversion, small-scale applications such as tandem, ... it's the best low-cost,high efficiency. After has gone through 10 version, NC ... most cost-effective to meet customer demand. Specialty:·Signalling support: SS7,PRI,Q.SIG,R2,V5.2 ...