Proxy Server

Proxy servers are computing devices (typically a server) that interface between data processing devices (e.g. computers) and other devices within a communications network. These devices may be located on the same local area network or an external network (e.g. the Internet). A proxy server usually has access to at least two communication interfaces. One interface communicates with a device requesting services (e.g. a client) and a device that is being requested for a service (the server).

This figure shows how a SIP proxy server is responsible for establishing communication connections between devices within a specific domain. In this example, when the proxy server receives a request message from a User Agent (UA) inviting another party to join a session, the proxy server forwards this invitation onwards (it acts as a proxy) to the designated User Agent. If the designated User Agent is unavailable, the proxy server may direct the connection request to the second User Agent or the connection request may be forwarded via one (or more) proxy servers.

Related Session Initiation Protocol - SIP Terms

End User Devices - User Agents
Proxy Servers
Registrars
Location Servers
Redirection Servers

Session Initiation Protocol - SIP Books

Introduction to Cable Television (CATV) Book

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Introduction to SIP IP Telephony Systems)

This book explains why people and companies are using SIP equipment and software to efficiently upgrade existing telephone systems, develop their own advanced communications services, and to more easily integrate telephone network with company information systems. This book also provides descriptions of the function parts of SIP systems and operations.

$14.99 Printed, $11.99 eBook

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