... the concept of carrier-grade embedded operating system, module structure. Single system for maximum 16 digital trunking E1 access.In the ... : SS7,PRI,Q.SIG,R2,V5.2;·Interface Connector: 16E1,1 10/100M network, 1 RS232 console;·Link: 16 SS7 links, 16 ... calling function to provide customize calling mode;·Voice management function with voice record and voice play;·Meeting function;·Calling number and ...