Signal & Syntax · Networks, HLR and porting
What Is SS7?
SS7 (Signaling System No. 7) carries call setup, SMS routing and subscriber queries between networks. The ITU-T standardizes SS7.SS7 (Signaling System No. 7) carries call setup, SMS routing and subscriber queries between networks. The ITU-T standardizes SS7.SS7 (Signaling System No. 7) carries call setup, SMS routing and subscriber queries between networks. The ITU-T standardizes SS7.
Also calledSignaling System No. 7 · C7
Example
SS7 in Practice
The CCITT, now ITU-T, standardized SS7 in the early 1980s. Signaling runs on its own channels, separate from the voice or message payload. The The CCITT, now ITU-T, standardized SS7 in the early 1980s. Signaling runs on its own channels, separate from the voice or message payload. The The CCITT, now ITU-T, standardized SS7 in the early 1980s. Signaling runs on its own channels, separate from the voice or message payload. The MAPMAP layer on top of SS7 handles mobile functions, including layer on top of SS7 handles mobile functions, including layer on top of SS7 handles mobile functions, including HLRHLR queries. HLR lookups travel over SS7 interconnects. queries. HLR lookups travel over SS7 interconnects. queries. HLR lookups travel over SS7 interconnects.
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Guide
HLR Lookup vs eHLR
Two ways to check whether a number is in use. Read the guide →Run the Checks on Your Own List
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