... according to International Telecom Standard, solves any signalling inter-work issues between various switches and equipment through E1(T1), with ... SS7, ISDN PRI, Q.SIG, V5.2, R2;·Multi router, inter-office management, Intelligent route distribute and telephone traffic sharing ... PRI, V5.2, R2, Q.931;Figure 2 Multi-Router ConnectionFigure 3 Call Back SystemFigure 4 Signaling CollectFigure 5 Recording ...