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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. ...

Wireshark Port Filter vs Protocol Filter When analyzing network traffic using Wireshark, it’s crucial to understand the difference between the filters to effectively isolate and examine relevant data. We will discuss on the basis of port 80 filter and HTTP filter. Because HTTP itself uses the port 80. So, their will be some key difference when using these two filters. Port Filter: For this filter specifically targets traffic on ports. On this case port 80, which is the standard port for HTTP communication. Use this filter when you want to focus solely on TCP connections established on port 80. It captures the entire TCP communication process, including TCP handshakes, acknowledgments, and data transfers. This filter is useful for gaining insights into low-level TCP interactions. Applying filter for port 80 ...

Introduction AutoCAD provides several function key shortcuts (F1 through F12), each of which is associated with a specific command or action. These shortcuts are designed to expedite your workflow and reduce the need to navigate through menus and toolbars constantly. Let’s delve into the most commonly used function key shortcuts and their corresponding functions. Key Combinations F1 - Help F1 is the universal Help key in most software applications, including AutoCAD. Pressing F1 brings up context-sensitive help, allowing you to quickly access information about the tool or command you’re using. It’s a valuable resource for learning and troubleshooting. ...