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 […]
Category: EUTRAN
Note: I’m running version 19.12.0 which I installed from the repos due to issues with 20.4.0 (latest when I wrote this) and stability on LimeSDR. I wrote the other day about installing SRS LTE stack, But installing it is one thing, meeting all the requirements to use it with your SDR hardware turns out to […]
Sending SMS over LTE using OsmoMSC and OsmoHLR and the SGs interface for SMSoS
Looking into the SGi interface for Circuit Switched Fallback in LTE to use GSM/UMTS networks for Calls & SMS
Using Wireshark to view and analyze MAC layer LTE traffic
Categories
Field Test on an iPhone
Accessing the Field Testing suite on an iOS Device
Multi-tenancy on the RAN side of the network, allowing an eNB to broadcast multiple PLMN IDs (MCC/MNC) in the System Information Block (SIB).
Lessons learned about setting up VoLTE / IMS Networks at small scale.
Categories
BaiCells Neutrino eNB Setup
Configuring BaiCells Neutrino eNB
How the P-CSCF address is assigned to a UE in Protocol Configuration Options (PCO) during bearer establishment.
Using SRS LTE Stack with the BladeRF x40 Software Defined Radio (SDR)
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.
Viewing the payload of an Encapsulated Security Payload in Wireshark.
Unlocking the built in IMS Debugging tool in Samsung’s Sysdump Utility
How to encode and decode MCC and MNC as PLMN Identifiers
Feature Update on PyHSS the Python Home Subscriber Server
Using osmo-sim-auth to query USIM/SIM cards authentication mechanism.
Exploring the how and why of Authentication in LTE & NR networks.
Importing Elevation data from ELVIS into Forsk Atoll