... SS7, ISDN PRI, Q.SIG, V5.2, R2;·Multi router, inter-office management, Intelligent route distribute and telephone traffic ... expand the capacity through multi stack;·Provide CTI Link API interface for user program control;Physical Specification: ItemSpecificationInput voltage-48V ... PRI, V5.2, R2, Q.931;Figure 2 Multi-Router ConnectionFigure 3 Call Back SystemFigure 4 Signaling CollectFigure 5 Recording ...