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SCCP Global Title Translation For Number PortabilityWhen a subscriber changes carrier but keeps the same telephone number, the network must discover the current destination before completing the call or…
Detecting SS7 spoofing through source point code verificationSS7 spoofing occurs when signalling traffic presents an unauthorised source point code (OPC) or imitates a trusted signalling node. If the receiving network…
Understanding SS7 Timers in the ISUP Call Release Phase (T1–T20)In an ISDN User Part (ISUP) call, timers control how long a signalling point waits for the next expected message. They prevent a circuit from remaining…
MTP3 Transfer Delayed and Transfer Restriction ProceduresMTP3 route-management messages help an SS7 network respond when a signalling point, linkset, or destination becomes unavailable, congested, or reachable only…
Troubleshooting ISUP Circuit Continuity Check FailuresAn ISUP Circuit Continuity Check (COT) verifies that a selected voice circuit has a usable transmission path before call setup proceeds. It is especially…
M3UA Routing Keys Using Point Code and SSNSIGTRAN carries traditional SS7 signalling over IP networks, allowing signalling points to communicate through SCTP and M3UA rather than dedicated TDM links.…
The use of the called party number in ISUP IAM routingIn ISUP, the Initial Address Message (IAM) carries the information an originating exchange needs to establish a circuit-switched call. Among its parameters,…
