Core-Network

Intro Signaling System No. 7 (SS7) is a global suite of protocols that defines how network elements in a public switched telephone network (PSTN) exchange information to route calls. Developed in the 1970s, it moved the industry away from “in-band” signaling—where control tones shared the same path as voices—to a much faster “out-of-band” system. By using a dedicated digital channel for signaling, SS7 allows for nearly instantaneous call setup and prevents the legacy “phreaking” fraud that once plagued phone lines. ...

The Dockerfile: Two Stages Think of this like a kitchen: the first stage is the messy prep area where you chop vegetables (the builder), and the second stage is the clean plate you serve to the customer (the production image). Stage 1: The Builder Dockerfile FROM ubuntu:latest as builder RUN apt-get update && apt-get install -y nginx COPY index.html /var/www/html FROM ubuntu:latest as builder: Starts with a full Ubuntu OS. We name this stage builder so we can reference it later. ...

Understanding MME States in the EPC: EMM vs. ECM In the LTE Evolved Packet Core (EPC), the Mobility Management Entity (MME) is the brain of the control plane. To manage a device (UE) efficiently, the MME uses two parallel state machines: EPS Mobility Management (EMM) and EPS Connection Management (ECM). Think of it this way: EMM determines if you are “checked in” to the network, while ECM determines if you are “actively talking” to it. ...