Categories
EPC IMS / VoLTE LTE Mobile Networks SDM Software

Diameter Routing Agents – Part 3 – Building a DRA with FreeDiameter

Using FreeDiameter as a DRA

Categories
EPC IMS / VoLTE LTE Mobile Networks RFCs & Standards SDM

Diameter Routing Agents (Why you need them, and how to build them) – Part 2 – Routing

Diving back into the world of Diameter Routing Agents with a look at the logic that defines how a DRA routes traffic from one place to another.

Categories
EPC IMS / VoLTE LTE Mobile Networks RFCs & Standards SDM

Diameter Routing Agents (Why you need them, and how to build them) – Part 1

An introduction to Diameter Routing Agents, covering what is a DRA is and why you need them in your life / network.

Categories
EPC IMS / VoLTE Mobile Networks SDM

FreeDiameter – Generating Certificates

Using OpenSSL to generate self-signed certs for use in FreeDiameter

Categories
Mobile Networks SDM Software VoIP

Cisco ITP / SS7 STP – Viewing MTP3 traffic from TDM Links

Okay, so a little late to the party on this one… The other day I had to setup a TDM (E1) based SS7 link (oh yes my friend – they still exist) to interconnect with another operator. I’m using Cisco’s ITP product as the STP / Signaling Gateway, and my trusty port mirror for what’s […]

Categories
CGrateS Mobile Networks SDM Software VoIP

CGrateS in Baby Steps – Part 4 – Rating Calls

In our last few posts we got CGrateS setup in order to have rates and tariffs in the system, so we can price a call. Where we ended we were able to use the APIerSv1.GetCost method to get the cost of a call, and today, we’re going to actually create some rated CDRs. So again […]

Categories
CGrateS Mobile Networks SDM Software VoIP

CGrateS in Baby Steps – Part 3 – RatingProfiles & RatingPlans

Finally rating a call end-to-end with CGrates!

Categories
CGrateS Mobile Networks SDM Software VoIP

CGrateS in Baby Steps – Part 2 – Adding Rates and Destinations through the API

CGRates in Baby Steps – Part 2 – Introduction to the CGrates API

Categories
GSM Mobile Networks SDM Software

USSD Gateway with Osmocom

Unstructured Supplementary Service Data or “USSD” is the stack used in Cellular Networks to offer interactive text based menus and systems to Subscribers. If you remember topping up your mobile phone credit via a text menu on your flip phone, there’s a good chance that was USSD*. For a period, USSD Services provided Sporting Scores, […]

Categories
5G SA Mobile Networks RFCs & Standards SDM Security

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.

Categories
5G SA Mobile Networks RFCs & Standards SDM

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.

Categories
5G SA EPC LTE Mobile Networks SDM

Backing up and Restoring Open5GS

How to backup and restore Open5Gs config between servers

Categories
EPC Mobile Networks SDM

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.

Categories
5G SA Mobile Networks SDM

EIR in 5G Networks (N5g-eir_EquipmentIdentityCheck)

A look at the Equipment Identity Register in 5G Core

Categories
EPC LTE Mobile Networks RFCs & Standards SDM VoIP

Basics of EPC/LTE Online Charging (OCS)

A glimpse into the complexities of prepaid billing (Online Charging) Diameter based networks.

Categories
EPC LTE Mobile Networks RFCs & Standards SDM

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.

Categories
EPC LTE Mobile Networks SDM SIM Cards

PS Data Off

How turning mobile data off, doesn’t, in LTE and 5G.

Categories
IMS / VoLTE Mobile Networks RFCs & Standards SDM VoIP

ENUM – DNS based Call Routing

Using DNS to resolve E.164 phone numbers to routable SIP URIs

Categories
EPC LTE Mobile Networks Python RFCs & Standards SDM Software

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 how it worked, reading references that looped into other references, in this case I was encoding MSISDN AVPs in Diameter. How to Encode a number […]

Categories
5G SA EPC EUTRAN LTE Mobile Networks RFCs & Standards SDM Security SIM Cards

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?