Recent Posts

The first SMS was sent in 1993, and all these years later as 5G rolls out, we’re still supporting it.

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 […]

A look at Centralized vs DeCentralized Online Charging with the aid of sugar.

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 […]

A look at the Equipment Identity Register in 5G Core

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

Using mod_httpapi to HTTP POST call recordings to a remote server

Setting up Open5Gs without a NAT requirement, and the routing required to do so.

Using ENUM to resolve E.164 numbers into SIP URIs using Kamailio.

A look at how the HSS can update the profile of an already in-use subscription using Insert Subscriber Data Request/Response.

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

A few .bashrc tweaks to improve the ‘history’ command

The strange history and triumphs of a group formed to protest the removal of letters from the dialing plan.

A Bind environment in a Docker container for experimenting and learning ENUM for DNS based Call Routing.

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