Getting from Point Code A to Point Code Z.
A look at how characters are encoded in an SMS.
Another deep dive into deceptively simple seeming functions to do with SMS.
5G introduces Network Slicing, or does it? A look at slicing mechanisms widely used in pre-5G networks.
Short messaging can be anything but simple…
How to find a subscriber location within the network.
A look at the Confidentiality Algorithms used in 3GPP Networks, MILENAGE, XOR & Comp128
A look at APDUs and Interacting with Cards
The basics of Smart Cards & their File System
Getting up close and personal with Smart Card / SIM Cards
Configuring the Osmocom Serving Gateway Support Node (SGSN) for 2G/3G networks.
Using a NanoVNA to analyse antenna performance for SDR driven Base Stations for GSM / LTE.
1 September 2000 was when the 3310 was released…
Unlocking Carrier Privileges through certificate on a UICC
What’s the deal with Tunnel Endpoint Identifiers and what do they do?
A look at the Handover process between Cells / BTSs in GSM using the Osmocom stack.
When setting up the timeslots on the TRX for each BTS on your BSC, you’ll notice you have to set a channel type. So what do these acronyms mean, and how do they affect the performance of the network? GSM channels break down into one of to categories, control channels – used for signalling, and … Continue reading GSM with Osmocom: Channel Types
Depending on if you’re wearing a tin foil hat or not, silent SMS and silent calls could be a useful tool to for administering the network or a backdoor put in to track citizenry! Regardless of it’s reasons for existence, let’s take a look at what it actually does, and how we can use it. … Continue reading GSM with Osmocom: Silent SMS & Silent Calls
So far we’ve focused on building a plain “2G” (voice and SMS only) network, which was all consumers expected twenty years ago. As the number of users accessing the internet through DSL, Dial Up & ISDN grew, the idea of getting this data “on the go” became more appealing. TCP/IP was becoming the dominant standard … Continue reading GSM with Osmocom: GPRS & Packet Data