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MTP2 State Machine: LSSU Signals and Link Alignment SequenceMTP2 is the data-link layer of SS7. It provides reliable transfer of signaling units between directly connected signaling points, using flags, sequence…
ISUP Cause Code 17 in User Busy Call ReleasesIn an SS7 network, ISUP cause code 17 indicates that the called user is busy. The destination exchange has received the call attempt, determined that the…
How Point Code Spoofing Weakens SS7 Network SecuritySignalling System No. 7 relies on structured addressing to move call-control, mobility, and service messages across telecom networks. At the MTP3 level, each…
GSM MAP Send Authentication Info Transaction Through TCAPGSM authentication depends on a signaling exchange that lets a serving network obtain security vectors from the subscriber’s home network. The MAP Send…
How to Read an SS7 Protocol Trace Step By StepAn SS7 protocol trace is a time-ordered record of signaling messages exchanged between network elements. Reading one effectively means connecting protocol…
MTP3 Priority, Congestion, And Link Load BalancingSignaling System No. 7 networks depend on MTP3 to select routes, manage linksets, and deliver signaling messages between switching centers, service control…
ISUP Preemption And Circuit Reservation For Emergency CallsEmergency voice traffic must reach a public safety answering point even when ordinary call demand is consuming available trunks. In circuit-switched SS7…
SIGTRAN SCTP Heartbeats and M3UA Path Failure DetectionReliable signaling over IP depends on detecting failure quickly without declaring a healthy route unavailable. In a SIGTRAN deployment, SCTP provides…
SLS and CIC in SS7 signaling networksSLS and CIC are both identifiers used in telephone signaling, but they solve different engineering problems. Signaling Link Selection helps distribute messages…
