Guides
SS7 Interworking With LTE Through SGs And CSFBLTE was designed around packet services, while traditional mobile voice depends on circuit-switched core networks and SS7 procedures. The SGs interface…
How to Identify a Misconfigured Point Code in Global Title TranslationGlobal Title Translation (GTT) connects subscriber-facing addresses with the signalling destinations that handle them. A small error in a point code,…
SCCP Connection-Oriented Signaling: CR, CC, DT, And RLSDSignalling Connection Control Part (SCCP) provides services above MTP3 in the SS7 protocol stack. Its connection-oriented mode creates a logical signalling…
Weighted MTP3 Load Sharing Across Uneven Link CapacitiesMTP3 load sharing distributes SS7 signalling traffic across links in the same linkset while preserving the routing behaviour expected by the network. When…
How SS7 timeouts increase post-dial delayPost-dial delay (PDD) is the time between a caller sending the final dialled digit and hearing ringing, an announcement, or a failure tone. In an SS7 network,…
ISUP Forward Transfer Signalling For Supplementary ServicesThe ISDN User Part (ISUP) Forward Transfer message, commonly identified as FOT, is a signalling mechanism used when a call needs an action at a distant…
SIGTRAN M2PA Roles In Point-To-Point LinksM2PA carries SS7 signalling over an IP network by using SCTP as its transport layer. It is designed for a direct signalling link between two peer endpoints,…
MAP Delete Subscriber Data: SS7 Transactions and Timer HandlingMAP Delete Subscriber Data is a signalling operation used to remove selected subscriber information from a serving node. In a traditional GSM network, the Home…
Understanding ANSI Versus ITU-T SS7 Point Code FormatsSignalling System No. 7 point codes identify nodes such as signal transfer points, service switching points, and service control points. They are essential to…
MTP2 Bit Stuffing Errors And Frame Abort BehaviourMTP2 provides the reliable signalling link layer beneath MTP3 in traditional SS7 networks. It frames signal units, checks their integrity with the check bits,…
