A look at how Cell Broadcast is signalling implemented between the MME and CBC in an LTE/EPC network.
Categories
Cell Broadcast in LTE
Category: RFCs & Standards
A look at the Network Function Repository Function (NRF) in 5G Core
Comparing the Control Plane signalling in 5GC compared to EPC.
How User Plane traffic is handled in 5GC compared to EPC
No talk of Augmented Reality, Holographic Video calls, 5G cities. Just info about real 5G topics for nerds.
Using FreeSWITCH to serve WebSocket / WebRTC connections
What the Origin-State-Id AVP does and how it is used to track if a Diameter peer restarts.
A look into the signalling messages between Network elements in an Evolved Packet Core exchanged during the Attach Procedure
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 […]
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.
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. […]
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 […]
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 […]
Some of the lesser used / utilized features of the SIP REGISTER method.
Categories
GTPv2 – F-TIED Interface Types
A quick look at the Interface Types in the F-TIED field in GTPv2
Lessons learned about setting up VoLTE / IMS Networks at small scale.
A look into Instant Messaging using SIP
An update to PyHSS to support IMS Authentication for VoLTE
The exchange between a UE and P-CSCF to put SIP traffic into IPsec encapsulated payloads.
Categories
SIP Supported & Require
Function of Supported & Require headers in SIP.