Nick vs Networking

RFCs & Standards

LTE UE Attach Procedures in Evolved Packet Core (EPC)

27/06/2020

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

21/06/2020

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 […]

Diameter-User-Authorization-Request-Command-Code-300-Packet-Capture

EPC

LTE

Mobile Networks

RFCs & Standards

Voice over IP

Diameter and SIP: User-Authorization-Request/Answer

20/06/2020

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 - Server Assignment Answer - All

EPC

LTE

Mobile Networks

RFCs & Standards

Voice over IP

Diameter and SIP: Server-Assignment-Request/Answer

14/06/2020

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. […]

LTE

Mobile Networks

RFCs & Standards

Voice over IP

Diameter and SIP: Location-Info-Request / Answer

13/06/2020

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 […]

Screenshot of packet capture of Diameter Multimedia-Auth-Request (Diameter Command Code 303) used for IMS authentication

EPC

LTE

Mobile Networks

RFCs & Standards

Diameter and SIP: Multimedia-Authentication-Request/Answer

07/06/2020

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 […]