Categories
SIM Cards

SIMtrace Cases

I put together some laser cut case designs for the Osmocom SIMtrace, Quite happy with the results. If you want to cut your own, I’ve sent the DXF files to the mailing list, and will try and add to the project. Also uploaded here as seems some folks had issues getting them from the mailing […]

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GSM Mobile Networks

GSM with Osmocom: OsmoSGSN for Packet Data

Configuring the Osmocom Serving Gateway Support Node (SGSN) for 2G/3G networks.

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EPC LTE Mobile Networks Software

List of Open Source Evolved Packet Core (EPC) Implementations

List of Open Source Evolved Packet Core implementations

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GSM Mobile Networks RF

GSM with Osmocom: Handovers

A look at the Handover process between Cells / BTSs in GSM using the Osmocom stack.

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GSM Mobile Networks RF

GSM with Osmocom: Channel Types

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 […]

Categories
GSM Mobile Networks

GSM with Osmocom: Silent SMS & Silent Calls

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. […]

Categories
GSM Mobile Networks

GSM with Osmocom: SS7 & Sigtran

SS7 Basics and Osmo-STP as a Signaling Transfer Point

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GSM Mobile Networks

GSM with Osmocom: NanoBTS

Setting up ipaccess NanoBTS on Osmocom’s OsmoBSC

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EPC EUTRAN GSM IMS / VoLTE LTE Mobile Networks

Sending SMS in Open5GS LTE Networks using the SGs Interface and OsmoMSC with SMSoS

Sending SMS over LTE using OsmoMSC and OsmoHLR and the SGs interface for SMSoS

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EPC EUTRAN GSM LTE Mobile Networks

OsmoMSC and Open5GS MME – SGs Interface for InterRAT Handover & SMS

Looking into the SGi interface for Circuit Switched Fallback in LTE to use GSM/UMTS networks for Calls & SMS

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GSM IMS / VoLTE Mobile Networks VoIP

GSM with Osmocom: Call routing in GSM

How call routing in GSM works and it’s application in the Osmocom suite

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GSM IMS / VoLTE Mobile Networks RF

GSM with Osmocom Part 9: Calls & SMS at last!

So now we’ve covered the basics of what’s involved let’s get some traffic on our network. For starters we’ll need to start each of our network elements and bring up whichever BTS hardware we’re using. In order for our calls to have audio, we’ll need to set a parameter on the Media Gateway. We’ll cover […]

Categories
GSM Mobile Networks

GSM with Osmocom Part 8: The Mobile Switching Center

Setting up the Mobile Switching Centre for a GSM network using OsmoMSC.

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GSM Mobile Networks SDM

GSM with Osmocom Part 7: The HLR – Home Location Register (and Friends)

What the Home Location Register (HLR) does in GSM, how to set it up and configure subscribers.

Categories
GSM Mobile Networks

GSM with Osmocom Part 6: Integrating our LimeSDR BTS with OsmoBSC

Connecting our LimeSDR based GSM BTS with OsmoBSC.

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GSM Mobile Networks

GSM with Osmocom Part 5: Software BTS with LimeSDR & osmo-bts-trx

Using a LimeSDR as a GSM BTS with Osmocom.

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GSM Mobile Networks

GSM with Osmocom Part 4: The Base Station Controller (BSC)

Configuring a GSM Base Station Controller with Osmocom stack.

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GSM Mobile Networks

GSM with Osmocom Part 3: Introduction to Osmo Software & Virtual BTS

Setting up a virtual BTS in our BSC with Osmocom.

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GSM Mobile Networks

GSM with Osmocom Part 2: BTS Basics

What’s a BTS and where do they fit into the GSM Network architecture?

Categories
GSM Mobile Networks

GSM with Osmocom Part 1: Intro

Intro to our post series on GSM using the Osmocom stack,