Categories
EUTRAN IMS / VoLTE LTE Mobile Networks RFCs & Standards SDM VoIP

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 […]

Categories
EUTRAN LTE Mobile Networks

srsLTE Install for BladeRF & LimeSDR on Debian / Ubuntu

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 […]

Categories
EPC EUTRAN GSM IMS / VoLTE LTE Mobile Networks

Sending SMS in Open5GS LTE Networks using the SGs Interface and OsmoMSC with SMSoS

Sending SMS over LTE using OsmoMSC and OsmoHLR and the SGs interface for SMSoS

Categories
EPC EUTRAN GSM LTE Mobile Networks

OsmoMSC and Open5GS MME – SGs Interface for InterRAT Handover & SMS

Looking into the SGi interface for Circuit Switched Fallback in LTE to use GSM/UMTS networks for Calls & SMS

Categories
EUTRAN LTE Mobile Networks

Working with LTE MAC traces in Wireshark

Using Wireshark to view and analyze MAC layer LTE traffic

Categories
EUTRAN GSM LTE Mobile Networks RF

Field Test on an iPhone

Accessing the Field Testing suite on an iOS Device

Categories
EPC EUTRAN LTE Mobile Networks

Multi Operator Core-Networks (MOCN) for RAN Sharing

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).

Categories
EPC EUTRAN IMS / VoLTE Kamailio LTE Mobile Networks RFCs & Standards SDM SIM Cards VoIP

Things I wish I knew about setting up private VoLTE Networks

Lessons learned about setting up VoLTE / IMS Networks at small scale.

Categories
EUTRAN LTE Mobile Networks

BaiCells Neutrino eNB Setup

Configuring BaiCells Neutrino eNB

Categories
EPC EUTRAN IMS / VoLTE LTE Mobile Networks SDM Security VoIP

VoLTE / IMS – P-CSCF Assignment

How the P-CSCF address is assigned to a UE in Protocol Configuration Options (PCO) during bearer establishment.

Categories
EUTRAN LTE Mobile Networks Software

SRS LTE – Software Defined LTE Stack with BladeRF x40

Using SRS LTE Stack with the BladeRF x40 Software Defined Radio (SDR)

Categories
EPC EUTRAN IMS / VoLTE LTE Mobile Networks Python RFCs & Standards SDM Software VoIP

PyHSS Update – IMS Cx Support!

An update to PyHSS to support IMS Authentication for VoLTE

Categories
EPC EUTRAN IMS / VoLTE LTE Mobile Networks RFCs & Standards VoIP

IMS / VoLTE IPsec on the Gm Interface

The exchange between a UE and P-CSCF to put SIP traffic into IPsec encapsulated payloads.

Categories
EPC EUTRAN IMS / VoLTE LTE Mobile Networks Security VoIP

Using Wireshark to peer inside IPsec ESP VoLTE data from the P-CSCF

Viewing the payload of an Encapsulated Security Payload in Wireshark.

Categories
EPC EUTRAN IMS / VoLTE LTE Mobile Networks Security Software VoIP

VoLTE/IMS Debugging on Samsung Handsets using Sysdump & Samsung IMS Logger

Unlocking the built in IMS Debugging tool in Samsung’s Sysdump Utility

Categories
EPC EUTRAN LTE Mobile Networks Python RFCs & Standards SDM SIM Cards Software

PLMN Identifier Calculation (MCC & MNC to PLMN)

How to encode and decode MCC and MNC as PLMN Identifiers

Categories
EPC EUTRAN LTE Mobile Networks Python RFCs & Standards SDM Security Software

PyHSS Update – MongoDB Backend & SQN Resync

Feature Update on PyHSS the Python Home Subscriber Server

Categories
EPC EUTRAN GSM LTE Mobile Networks RFCs & Standards SDM Security SIM Cards

Querying Auth Credentials from USIM/SIM cards

Using osmo-sim-auth to query USIM/SIM cards authentication mechanism.

Categories
EPC EUTRAN LTE Mobile Networks RF SDM Security SIM Cards

HSS & USIM Authentication in LTE/NR (4G & 5G)

Exploring the how and why of Authentication in LTE & NR networks.

Categories
Australian Telco EUTRAN Mobile Networks Software

Making use of Australian Elevation Data in Forsk Atoll

Importing Elevation data from ELVIS into Forsk Atoll