A look at how the SQN resync procedure is performed in the IMS Authentication flows
A look at the PCRF in EPC Networks, and the Charging Rules that lay at the heart of it all.
Adventures in setting up a non-working USSD Gateway for IMS
An overview of the who, how and why of Non-IP Data Deliver in NB-IoT cellular services.
A look at why we’d want to apply translations to Diameter AVPs inside a Diameter Routing Agent
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.
An introduction to Diameter Routing Agents, covering what is a DRA is and why you need them in your life / network.
Filtering for 3gppnetwork.org domains in Wireshark to make your troubleshooting easier
Using Android’s development features to allow remote control of a UE in the field for testing the cellular network.
If you’ve ever received an SMS from your operator, and the sender was the Operator name for example, you may be left wondering how it’s done. In IMS you’d think this could be quite simple – You’d set the From header to be the name rather than the MSISDN, but for most SMSoIP deployments, the […]
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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
A look at how Dedicated Bearers get established for VoLTE.
Backing up and Restoring Open5GS
How to backup and restore Open5Gs config between servers
A glimpse into the complexities of prepaid billing (Online Charging) Diameter based networks.
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.
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?