Building Telephony Systems with OpenSIPS 1.6 by Flavio E. Goncalves

By Flavio E. Goncalves

It is a functional, hands-on e-book established round a fictitious case examine VoIP supplier that you're going to construct on a improvement server utilizing OpenSIPS 1.6. The case research grows bankruptcy via bankruptcy, from fitting your neighborhood improvement server, correct as much as the completed VoIP supplier. This publication is for readers who are looking to know the way to construct a SIP supplier from scratch utilizing OpenSIPS. it's compatible for VoIP prone, huge agencies, and universities. Telephony and Linux adventure might be precious yet isn't crucial. Readers needn't have earlier wisdom of OpenSIPS. This booklet also will support readers who have been utilizing OpenSER yet are actually stressed with the hot OpenSIPS.

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Cfg file is the OpenSIPS main configuration file. cfg file has several sections, which are as follows: • • • • • • • • • • Global definitions: This portion of the file contains several working parameters for OpenSIPS, including the listening ip:port pair for the SIP service and debug level. These global parameters affect the OpenSIPS core and all the modules globally. Modules: Contains a list of external libraries required to expose the functionalities not available in the core. Modules are loaded with loadmodule.

22 ] This material is copyright and is licensed for the sole use by Betty Vaughan-Pope on 1st February 2010 2601 S Broadway St, Unit 29, La Porte, , 77571 Chapter 1 Here is the INVITE (SDP offer) message: The following screenshot shows the "200 Ok" (SDP answer) reply: [ 23 ] This material is copyright and is licensed for the sole use by Betty Vaughan-Pope on 1st February 2010 2601 S Broadway St, Unit 29, La Porte, , 77571 Introduction to SIP 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.

This SDP message is carried by the SIP message, similar to an e-mail attachment. The phone does not know the location of userB or the server responsible for domainB. Thus, it sends the INVITE request to the server responsible for the domain sipA. This address is configured in the phone of userA or can be discovered by DHCP. com. The sequence is as follows: 1. In this example, the proxy receives the INVITE request and sends a message "100 trying" back to userA, signaling that the proxy receives the INVITE and is working to forward the request.

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