By Flavio E. Goncalves
This publication teaches easy methods to enhance a quick and versatile consultation Initiation Protocol (SIP) server utilizing OpenSER and indicates how OpenSER can be utilized to enforce positive aspects 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 adventure might be important yet isn't really crucial. Readers needn't have earlier wisdom of OpenSER.
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Additional info for Building Telephony Systems with OpenSER: A step-by-step guide to building a high performance Telephony System
Request for current contact list—In this case, the user agent will send the CONTACT header field empty, indicating the user wishes to query the server for the current contact list. In the 200 OK message, the SIP server will send the current contact list in the CONTACT header field. 4. Cancellation of a registration—The user agent now sends the message with an EXPIRES header field of 0 and a CONTACT HEADER field configured as '*' to apply to all existing contacts. 5. Unsuccessful Registration—The UAC sends a Register Request and receives a "401 Unauthorized" message, in exactly the same way as the successful registration.
PSTN Gateway To communicate to the public switched telephone network, a PSTN gateway is required. Usually this gateway will interface to the PSTN using E1 or T1 trunks. The most common products in this arena are gateways from Cisco, AudioCodes, and Quintum. Asterisk is gaining market in this area, because of its price per port cost, sometimes 75% less than the competitors. To evaluate a good gateway, check the support of SIP extensions such as RFC3515 (REFER), RFC3891 (Replaces), and RFC3892 (Referred by).
The SIP Express Router is an open-source SIP proxy server compliant to the IETF RFC3261 SIP protocol. It is targeted at large volume applications. [ 30 ] Chapter 2 With its small footprint the SER is extremely fast to forward requests and can handle thousands of users in a single server. It is being used by large voice-over-IP providers and for embedded IP PBXes with very low processing power. Their interoperability with several sorts of equipment makes them a de facto standard. What Software to Use, SER or OpenSER?
Building Telephony Systems with OpenSER: A step-by-step guide to building a high performance Telephony System by Flavio E. Goncalves