Testing Mobile Networks with Remote Test Phones
Nick Using Android's development features to allow remote control of a UE in the field for testing the cellular network.
LTE
CGrates in Baby Steps – Part 1
Getting started with CGrateS to bill for calls in a Telecom environment.
Evolved Packet Core – Analysis Challenge
Step right up folks and test your skills on EPC with this PCAP analysis challllleeennnggeee!
The Surprisingly Complicated World of SMS: Apple iPhone MT SMS
Quirks and gotchas of working with SMS on IMS on iPhones.
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.
Backing up and Restoring Open5GS
How to backup and restore Open5Gs config between servers
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.
Basics of EPC/LTE Online Charging (OCS)
A glimpse into the complexities of prepaid billing (Online Charging) Diameter based networks.
Open5GS without NAT
Setting up Open5Gs without a NAT requirement, and the routing required to do so.
Diameter – Insert Subscriber Data Request / Response
A look at how the HSS can update the profile of an already in-use subscription using Insert Subscriber Data Request/Response.
PS Data Off
How turning mobile data off, doesn't, in LTE and 5G.
Docker & BIND as an ENUM Playground
A Bind environment in a Docker container for experimenting and learning ENUM for DNS based Call Routing.
Looking inside the MMS Exchange (With call flow and PCAP)
A look at Multimedia Messaging (MMS) in 3GPP Networks and how it actually works.
Telephony binary-coded decimal (TBCD) in Python with Examples
Chances are if you’re reading this, you’re trying to work out what Telephony Binary-Coded Decimal encoding is. I got you. Again I found myself staring at encoding trying to guess…
The PLMN Problem for Private LTE / 5G
As the number of Private Networks built on LTE and 5G grow, how will PLMN allocation be managed?
How UEs get Time in LTE
How does "Network Time" actually get to the UE?
Diameter Agents
A look at the 4 types of Diameter Agent
SCTP Parameter Tuning
A look at tuning your SCTP parameters to detect failures quickly and reduce dropped packets when they happen.
IMS Routing with iFCs
Peer behind the magic curtain at how IMS networks route your VoLTE and VoNR calls, and how iFC (Initial Filter Criteria) achieve this.