Peer behind the magic curtain at how IMS networks route your VoLTE and VoNR calls, and how iFC (Initial Filter Criteria) achieve this.
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IMS Routing with iFCs
5G introduces Network Slicing, or does it? A look at slicing mechanisms widely used in pre-5G networks.
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Adding Vlans to VMware Workstation
Just discovered you can add VLANs to Realtek NICs on Windows PCs, I have a fairly grunty desktop I use for running anything that needs Windows, running VMware Workstation and occasional gaming, I do have a big Dell machine running ESXi which supports VLAN tagging and trunking, but I try and avoid using it as […]
Adding support for AMR Codec in FreeSWITCH
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K8s multiple objects in YAML File
Defining multiple K8 objects in the same YAML file
Getting to know IPfilterRules and the Flow-Description AVP
Since the beginning of time, SIP has used the 2xx responses to confirm all went OK. If you thought sending an SMS in a VoLTE/IMS network would see a 2xx OK response and then that’s the end of it, you’d be wrong. So let’s take a look into sending SMS over VoLTE/IMS networks! So our […]
A look at non-IP transport for 5G including Ethernet.
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Open5Gs Database Schema Change
As Open5Gs has introduced network slicing, which led to a change in the database used, Alas many users had subscribers provisioned in the old DB schema and no way to migrate the SDM data between the old and new schema, If you’ve created subscribers on the old schema, and now after the updates your Subscriber […]
I’d been trying for some time to get Kamailio acting as a Diameter Routing Agent with mixed success, and eventually got it working, after a few changes to the codebase of the ims_diameter_server module. It is rather unstable, in that if it fails to dispatch to a Diameter peer, the whole thing comes crumbling down, […]
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Diff + Wireshark
Comparing packet contents with Wireshark and a diff utility
Introducing YAML based config files for defining how PyHSS should be setup
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Offtopic – HDMI & USB over Twisted Pair
I wanted to be able to use my desktop computer which lives in my office, on the TV in the living room. Long HDMI cables would involve me climbing around under the house, and making more holes in the walls, and most wireless keyboard/mouse combos wouldn’t reach that far and USB has a limit of […]
Peculiar padding problem perplexes poor programmer.
Lessons in mmWave from the 1960s.
I’d tried in the past to use the USB port on the Mikrotik, an external HDD and the SMB server in RouterOS, to act as a simple NAS for sharing files on the home network. And the performance was terrible. This is because the device is a Router. Not a NAS (duh). And everything I […]
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PyHSS Update – SCTP Support
Info on PyHSS new support for SCTP as well as TCP.
How to find a subscriber location within the network.
Thanks to some recent developments, PyHSS has had a major overhaul recently, and is getting better than ever, Some features that are almost ready for public release are: Config File Instead of having everything defined all over the place a single YAML config file is used to define how the HSS should function. SCTP Support […]
A look at MTU and its role in LTE and 5G Transmission.