EUTRAN
EPC
EUTRAN
LTE
Mobile Networks
BaiCells USIM PLMN Issues (MNC 314 / MCC 030 vs MNC 311 / MCC 98)
Why the BaiCells PLMN changes?
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EPC
EUTRAN
LTE
Mobile Networks
RFCs & Standards
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
Read MoreEUTRAN
LTE
Mobile Networks
RFCs & Standards
Voice over IP
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 […]
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EUTRAN
LTE
Mobile Networks
srsLTE Install for BladeRF & LimeSDR on Debian / Ubuntu
Note: I’m running 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 be […]
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EPC
EUTRAN
GSM
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
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EPC
EUTRAN
GSM
LTE
Mobile Networks
OsmoMSC and Open5GS MME – SGs Interface for CSCF / InterRAT Handover
Looking into the SGi interface for Circuit Switched Fallback in LTE to use GSM/UMTS networks for Calls & SMS
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EUTRAN
LTE
Mobile Networks
Working with LTE MAC traces in Wireshark
Using Wireshark to view and analyze MAC layer LTE traffic
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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).
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EPC
EUTRAN
Kamailio
LTE
Mobile Networks
RFCs & Standards
Voice over IP
Things I wish I knew about setting up private VoLTE Networks
Lessons learned about setting up VoLTE / IMS Networks at small scale.
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EPC
EUTRAN
LTE
Security
Voice over IP
VoLTE / IMS – P-CSCF Assignment
How the P-CSCF address is assigned to a UE in Protocol Configuration Options (PCO) during bearer establishment.
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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)
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EPC
EUTRAN
LTE
Mobile Networks
Python
RFCs & Standards
Software
Voice over IP
PyHSS Update – IMS Cx Support!
An update to PyHSS to support IMS Authentication for VoLTE
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EPC
EUTRAN
LTE
RFCs & Standards
Voice over IP
IMS / VoLTE IPsec on the Gm Interface
The exchange between a UE and P-CSCF to put SIP traffic into IPsec encapsulated payloads.
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EPC
EUTRAN
LTE
Security
Voice over IP
Using Wireshark to peer inside IPsec ESP VoLTE data from the P-CSCF
Viewing the payload of an Encapsulated Security Payload in Wireshark.
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EPC
EUTRAN
LTE
Mobile Networks
Security
Software
Voice over IP
VoLTE/IMS Debugging on Samsung Handsets using Sysdump & Samsung IMS Logger
Unlocking the built in IMS Debugging tool in Samsung’s Sysdump Utility
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EPC
EUTRAN
LTE
Mobile Networks
Python
RFCs & Standards
Software
PLMN Identifier Calculation (MCC & MNC to PLMN)
How to encode and decode MCC and MNC as PLMN Identifiers
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EPC
EUTRAN
LTE
Python
RFCs & Standards
Security
Software
PyHSS Update – MongoDB Backend & SQN Resync
Feature Update on PyHSS the Python Home Subscriber Server
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EPC
EUTRAN
GSM
LTE
Mobile Networks
RFCs & Standards
Security
Querying Auth Credentials from USIM/SIM cards
Using osmo-sim-auth to query USIM/SIM cards authentication mechanism.
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