EPC
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
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EPC
LTE
Mobile Networks
RFCs & Standards
Voice over IP
Diameter and SIP: User-Authorization-Request/Answer
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.
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EPC
LTE
Mobile Networks
RFCs & Standards
Voice over IP
Diameter and SIP: Server-Assignment-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 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. […]
Read MoreEPC
LTE
Mobile Networks
RFCs & Standards
Voice over IP
Diameter and SIP: Location-Info-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 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 […]
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EPC
LTE
Mobile Networks
RFCs & Standards
Diameter and SIP: Multimedia-Authentication-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 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 […]
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EPC
LTE
Mobile Networks
Connecting any 3rd Party HSS to Open5GS MME
Connecting an external / 3rd party HSS to Open5GS
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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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EPC
Kamailio
LTE
Software
Voice over IP
Kamailio Proxy-CSCF Pull
My first Pull / Merge in the Kamailio project was to fix the IMS P-CSCF config
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EPC
LTE
Mobile Networks
Python
Open5GS Python Library / API
A while ago I wrote a Python library for interfacing Open5GS HSS to Python. The Open5GS HSS uses a MongoDB backend, so the library is just running formatted Mongo queries. You can create, edit and delete subscribers in the HSS, along with modifying any parameters you can from the WebUI. Take a look: https://github.com/open5gs/open5gs/tree/master/misc/db/python
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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
LTE
Python
Ansible for Scaling and Deployment of Evolved Packet Core NEs
Using Ansible to orchestrate EPC Network Elements
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EPC
LTE
Python
RFCs & Standards
GTPv2 – F-TIED Interface Types
A quick look at the Interface Types in the F-TIED field in GTPv2
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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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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
Kamailio
LTE
Kamailio Bytes – Configuring Diameter Peers with CDP
Introducing C Diameter Peer module in Kamailio to manage Diameter Peers, monitor their state and handle the connections.
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