Categories
Mobile Networks Voice over IP

Demystifying SS7 & Sigtran – Part 5 – What layer to Split

A look at taking SS7 traffic and putting it onto IP / SIGTRAN links on the MTP2 / Layer 2 level.

Categories
5G SA IMS / VoLTE Kamailio LTE Mobile Networks Voice over IP

The Surprisingly Complicated World of SMS: Apple iPhone MT SMS

Quirks and gotchas of working with SMS on IMS on iPhones.

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Software Voice over IP

Installing Yate from Source on Ubuntu 20.04

Build instructions for YaTE

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Kamailio Voice over IP

Kamailio Bytes – Working with Redis

Using Redis with Kamailio

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FreeSWITCH IMS / VoLTE Kamailio Mobile Networks Voice over IP

FreeSWITCH as an IMS Application Server

Using FreeSWITCH as an IMS Application Server

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GSM Mobile Networks RFCs & Standards Software Voice over IP

Demystifying SS7 & Sigtran – Part 4 – Routing with Point Codes

Getting from Point Code A to Point Code Z.

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Mobile Networks RFCs & Standards Voice over IP

Demystifying SS7 & Sigtran – Part 3 – SS7 Lab in GNS3

Setting up our GNS3 environment with a bunch of SS7 Nodes

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Mobile Networks RFCs & Standards Voice over IP

Demystifying SS7 & Sigtran (With Labs!) – Part 2 – Ingredients Needed

Looking at the basic components that make up our SS7 Networks.

Categories
Mobile Networks RFCs & Standards Voice over IP

Demystifying SS7 & Sigtran Networks (With Labs!) – Part 1 – Intro

Taking a look at the basics of the SS7 Protocol Stack.

Categories
Kamailio Voice over IP

Handling multiple SIP headers with the same name in Kamailio

Some tricks to handle if you’ve got multiple headers all with the same name in Kamailio

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FreeSWITCH Voice over IP

Originating calls in FreeSWITCH

Starting calls from FreeSWITCH

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Kamailio Voice over IP

Kamailio Bytes – Using Rtimer to run Jobs

Using the Rtimer module and UAC to be annoying, or very useful.

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EPC LTE Mobile Networks RFCs & Standards SDM Voice over IP

Basics of EPC/LTE Online Charging (OCS)

A glimpse into the complexities of prepaid billing (Online Charging) Diameter based networks.

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FreeSWITCH Voice over IP

HTTP PUT call recordings from FreeSWITCH

Using mod_httpapi to HTTP POST call recordings to a remote server

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Kamailio Voice over IP

ENUM in Practice with Kamailio

Using ENUM to resolve E.164 numbers into SIP URIs using Kamailio.

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EPC Mobile Networks RFCs & Standards Voice over IP

Docker & BIND as an ENUM Playground

A Bind environment in a Docker container for experimenting and learning ENUM for DNS based Call Routing.

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IMS / VoLTE Mobile Networks RFCs & Standards SDM Voice over IP

ENUM – DNS based Call Routing

Using DNS to resolve E.164 phone numbers to routable SIP URIs

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5G SA EPC IMS / VoLTE LTE Mobile Networks SDM Voice over IP

IMS Routing with iFCs

Peer behind the magic curtain at how IMS networks route your VoLTE and VoNR calls, and how iFC (Initial Filter Criteria) achieve this.

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FreeSWITCH IMS / VoLTE Mobile Networks Voice over IP

Adding support for AMR Codec in FreeSWITCH

Adding support for AMR Codec in FreeSWITCH

Categories
EPC Kamailio LTE Mobile Networks SDM Software

A very unstable Diameter Routing Agent (DRA) with Kamailio

I’d been trying for some time to get Kamailio acting as a Diameter Routing Agent with mixed success, and eventually got it working, after a few changes to the codebase of the ims_diameter_server module. It is rather unstable, in that if it fails to dispatch to a Diameter peer, the whole thing comes crumbling down, […]