Using FreeSWITCH as an IMS Application Server
Category Archives: Mobile Networks
ITU International Point Code Structure
A brief look at International Signaling Point Code numbering and what it all means.
Demystifying SS7 & Sigtran – Part 4 – Routing with Point Codes
Getting from Point Code A to Point Code Z.
Demystifying SS7 & Sigtran – Part 3 – SS7 Lab in GNS3
Setting up our GNS3 environment with a bunch of SS7 Nodes
Demystifying SS7 & Sigtran (With Labs!) – Part 2 – Ingredients Needed
Looking at the basic components that make up our SS7 Networks.
Demystifying SS7 & Sigtran Networks (With Labs!) – Part 1 – Intro
Taking a look at the basics of the SS7 Protocol Stack.
Huawei Baseband Cheat Sheet
Quick reference guide for the types and capacities of Huawei BBU 3900 Series cards
Lifecycle of a Dedicated Bearer – From Flow-Description AVP to Traffic Flow Templates
A look at how Dedicated Bearers get established for VoLTE.
Some thoughts on NRF Security in 5G Core
A look at attack vectors the NRF opens up in #5G Core networks, and the mitigations recommended by 3GPP.
If you like Pina Coladas, and service the control plane – Intro to NRF in 5GC
Looking for Love in the 5G Core?
Let’s look at our matchmaker – The Network Repository Function in 5G Core.
The Surprisingly Complicated World of SMS: Special Characters
A look at how characters are encoded in an SMS.
Backing up and Restoring Open5GS
How to backup and restore Open5Gs config between servers
GTP Extension Headers (PDU session user plane protocol) in 5GC
How GTP is extended in 5G Core Networks to support extra QoS functionality like Reflective QoS and Delay Indicators
The Surprisingly Complicated World of SMS: Concatenated / Multipart SMS
Another deep dive into deceptively simple seeming functions to do with SMS.
Framed Routing in 5G
5GC includes native support for framed-routing.
Reflective QoS in 5G
A great new feature of #5G Core Networks is Reflective QoS – Where QoS of the traffic coming to a UE is reflected on the QoS coming out.
SMS in 5GC
The first SMS was sent in 1993, and all these years later as 5G rolls out, we’re still supporting it.
5G Online Charging with the Nchf_ConvergedCharging SBI
There’s no such thing as a free lunch, and 5G is the same – services running through a 5G Standalone core need to be billed. In 5G Core Networks, the SMF (Session Management Function) reaches out to the CHF (Charging Function) to perform online charging, via the Nchf_ConvergedCharging Service Based Interface (aka reference point). Like … Continue reading 5G Online Charging with the Nchf_ConvergedCharging SBI
Jaffa Cakes explain the nuances between Centralized vs Decentralized Online Charging in 3GPP Networks
A look at Centralized vs DeCentralized Online Charging with the aid of sugar.
Converting Elevation Data (DEM) for Forsk Atoll
After headaches importing elevation (DEM) data into Forsk Atoll, I found a better mechanism for converting them, I’d been having issues with as soon as the elevation passed 255 meters, resetting to 0 in the PNG as it didn’t understand values beyond this. I was able to open the elevation data in GlobalMapper (You can … Continue reading Converting Elevation Data (DEM) for Forsk Atoll
Random Posts on Mobile Networks
VoLTE/IMS Debugging on Samsung Handsets using Sysdump & Samsung IMS Logger
Message Amplification & UDP Flooding with SIP
OsmoMSC and Open5GS MME – SGs Interface for InterRAT Handover & SMS
Pre-5G Network Slicing
RTPengine – Installation & Configuration
Demystifying SS7 & Sigtran Networks (With Labs!) – Part 1 – Intro
IMTx: NET02x (4G Network Essentials) – Mobility Management – 4. Changing MME and SGW
The Surprisingly Complicated World of SMS: Special Characters
SIP Extensions – Path
