Comparing packet contents with Wireshark and a diff utility
Category Archives: RFCs & Standards
MSISDN Encoding in Diameter AVPs – Brought to you by the letter F
Peculiar padding problem perplexes poor programmer.
And the call was coming from… INSIDE THE HOUSE. A look at finding UE Locations in LTE
How to find a subscriber location within the network.
Dr StrangeEncoding or: How I learned to stop worrying and love ASN.1
Australia is a strange country; As a kid I was scared of dogs, and in response, our family got a dog. This year started off with adventures working with ASN.1 encoded data, and after a week of banging my head against the table, I was scared of ASN.1 encoding. But now I love dogs, and … Continue reading Dr StrangeEncoding or: How I learned to stop worrying and love ASN.1
SCTP Multihoming
A look at SCTP multi-homing in practice.
Getting the GTP-U Packets flowing Fast – DPDK & SR-IOV
How SR-IOV and DPDK play into faster performance of Virtual Network Functions (VNFs) for 3GPP core networks.
Confidentiality Algorithms in 3GPP Networks: MILENAGE, XOR & Comp128
A look at the Confidentiality Algorithms used in 3GPP Networks, MILENAGE, XOR & Comp128
Cell Broadcast in LTE
A look at how Cell Broadcast is signalling implemented between the MME and CBC in an LTE/EPC network.
5GC: The Network Function Repository Function
A look at the Network Function Repository Function (NRF) in 5G Core
5GC for EPC Folks – Control Plane Signalling
Comparing the Control Plane signalling in 5GC compared to EPC.
5GC for EPC Folks – User Plane Traffic
How User Plane traffic is handled in 5GC compared to EPC
Meta: 5G on this Blog
No talk of Augmented Reality, Holographic Video calls, 5G cities. Just info about real 5G topics for nerds.
FreeSWITCH WebRTC with sipML5
Using FreeSWITCH to serve WebSocket / WebRTC connections
Diameter Dispatches – Origin-State-Id AVP
What the Origin-State-Id AVP does and how it is used to track if a Diameter peer restarts.
LTE UE Attach Procedures in Evolved Packet Core (EPC)
A look into the signalling messages between Network elements in an Evolved Packet Core exchanged during the Attach Procedure
Diameter and SIP: Registration-Termination-Request / Answer
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Registration-Termination Request / Answer allow a Diameter Client (S-CSCF) to indicate to the HSS (Diameter Server) that it is no longer serving that user and the registration has … Continue reading Diameter and SIP: Registration-Termination-Request / Answer
Diameter and SIP: User-Authorization-Request/Answer
The Diameter User-Authorization-Request and User-Authorization-Answer commands are used as the first line of authorization of a user and to determine which Serving-CSCF to forward a request to.
Diameter and SIP: Server-Assignment-Request/Answer
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Server-Assignment-Request/Answer commands are used so a SIP Server can indicate to a Diameter server that it is serving a subscriber and pull the profile information of the subscriber. … Continue reading Diameter and SIP: Server-Assignment-Request/Answer
Diameter and SIP: Location-Info-Request / Answer
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Location-Information-Request/Answer commands are used so a SIP Server query a Diameter to find which P-CSCF a Subscriber is being served by Basics: The RFC’s definition is actually pretty … Continue reading Diameter and SIP: Location-Info-Request / Answer
Diameter and SIP: Multimedia-Authentication-Request/Answer
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Multimedia-Authentication-Request/Answer commands are used to Authenticate subscribers / UAs using a variety of mechanisms such as straight MD5 and AKAv1-MD5. Basics: When a SIP Server (S-CSCF) receives a … Continue reading Diameter and SIP: Multimedia-Authentication-Request/Answer
Random Posts on RFCs & Standards
Diameter and SIP: Multimedia-Authentication-Request/Answer
Kamailio Bytes – SIP UAC Module to act as a UAC / SIP Client
The PLMN Problem for Private LTE / 5G
Pre-5G Network Slicing
Message Amplification & UDP Flooding with SIP
ITU International Point Code Structure
Virtualized Transcoding Dimensioning
Diameter and SIP: Server-Assignment-Request/Answer
IMTx: NET02x (4G Network Essentials) – Management of Data Flows – 7. NAS and Global View of Protocol Stack
