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Everything about Signalling System No. 7

Set of telephony signaling protocols

Signalling System No. 7 (SS7) is a set of telephony signaling protocols developed in the 1970s that is used to setup and teardown telephone calls on most parts of the global public switched telephone network (PSTN). The protocol also performs number translation, local number portability, prepaid billing, Short Message Service (SMS), and other services. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Signalling System No. 7A 5-minute orientation
  2. Skim a recent paper: Antioxidant Defense System in Plants: Reactive Oxygen Species Production, Signaling, and Scavenging During Abiotic Stress-Induced Oxidative DamageInfluential work since 2022
  3. Pick up a classic book: Railroad accident reportThe most-reprinted book on the subject
  4. Read the landmark paper: Purinergic signalling in the nervous system: an overviewCited 748 times
  5. Go sideways: Message Transfer PartA closely related topic
  6. Go sideways: Common-channel signalingA closely related topic

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