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EPC EUTRAN LTE Mobile Networks RFCs & Standards Voice over IP

The case for Header Compression in VoIP/VoLTE

Robust Header Compression (ROHC) and it’s use for compressing RTP / VoLTE traffic headers.

Categories
RFCs & Standards Voice over IP

SIP SDP – ptime

SDPs ptime values, what it means, how it can go wrong and how to fix it.

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Kamailio Voice over IP

Virtualized Transcoding Dimensioning

Load testing a standard VM to see how many RTPengine transcoding sessions it can manage concurrently

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Python Voice over IP

RTPengine Python API Calls via ng Control Protocol

Connecting to RTPengine via Python

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Australian Telco Kamailio RFCs & Standards Voice over IP

Kamailio Bytes – Routing to geo local RTPengine Instances with Kamailio

Using Kamailio to route traffic to the nearest geographical RTPengine instance for lowest latency/best experience.

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Python RFCs & Standards Voice over IP

PyRTP – Simple RTP Library for Python

Basic usage of a Python RTP library I wrote

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Kamailio Voice over IP

Transcoding with RTPengine and Kamailio

Using RTPengine and Kamailio to transcode

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Kamailio Linux Voice over IP

Kamailio Bytes – Setting up rtpengine in Kamailio to relay RTP / Media

Using rtpengine to bridge calls in Kamailio

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RFCs & Standards Voice over IP

RTP – More than you wanted to know

Workhorse of VoIP / VoLTE / SIP / H.323 / IMS, we take a deep dive into what every bit of RTP means. Pun very much intended.

Categories
RFCs & Standards Voice over IP

SDP – Session Description Protocol – Overview

Understanding the SDP protocol and how it’s used to negotiate and setup media sessions.

Categories
RFCs & Standards Voice over IP

DTMF over IP – SIP INFO, Inband & RTP Events

DTMF’s implementation in VoIP and the 3 types of DTMF encoding (Inband, RTP Event and SIP INFO)

Categories
RFCs & Standards Voice over IP

RFC2833 – RTP Events

RFC2833 was designed to carry DTMF signalling, other tone signals and telephony events in RTP packets. This was later superseded by RFC4733, but everyone still referrers to this protocol as RFC2833, so I will too. RFC2833 a special RTP payload designed to carry DTMF signalling information, so it operates on the same source / destination […]