Read e-book online Building Telephony Systems with OpenSER: A step-by-step PDF

By Flavio E. Goncalves

ISBN-10: 1847193730

ISBN-13: 9781847193735

This publication teaches how one can advance a quick and versatile consultation Initiation Protocol (SIP) server utilizing OpenSER and indicates how OpenSER can be utilized to enforce gains no longer on hand in Asterisk PBX. This e-book is for readers who are looking to know the way to construct a SIP supplier from scratch utilizing OpenSER. Telephony and Linux event may be important yet isn't crucial. Readers needn't have earlier wisdom of OpenSER.

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Extra info for Building Telephony Systems with OpenSER: A step-by-step guide to building a high performance Telephony System

Example text

You can observe that the GSM codec is offered, but the other phone does not support it. 729. The session rtpmap:101 is the DTMF-relay described in the RFC2833. INVITE (SDP Offer). [ 24 ] Chapter 1 200 OK (SDP Answer). The SIP Protocol and the OSI Model It is always important to understand the voice protocols against the OSI model to situate where each protocol fits. [ 25 ] Introduction to SIP The VoIP Provider "Big Picture" Before we start to dig in the SIP proxy it is important to understand all the components for a VoIP provider solution.

20 ] Chapter 1 The CONTENT-TYPE and CONTENT-LENGTH header-fields give some information about the the SDP header ahead. The SDP header contains media-related parameters used to establish the RTP session. 1. In this case, the message "200 Ok" is sent back through both proxies and is received by userA and then the phone stops ringing back indicating that the call was accepted. 2. Finally userA sends an ACK message to userB's phone confirming the reception of the "200 OK" message. In this example the ACK is sent directly from phoneA to phoneB avoiding both proxies.

27 ] Introduction to SIP CDRTool Rating The RADIUS server has information about call duration, but does not have information about the rates and prices for the call. Applying prices to calls can be very tricky. com). It will be responsible for applying rates to calls. Monitoring Tools Finally we will need monitoring, troubleshooting, and testing tools to help debug any problems occurring in the SIP server. The first tool is the protocol analyzer and we will see how to use ngrep, ethereal, and tethereal.

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Building Telephony Systems with OpenSER: A step-by-step guide to building a high performance Telephony System by Flavio E. Goncalves


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