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Session Initiation Protocol - SIP Book
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Proxy ServerProxy 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).
Proxy Server Operation
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.
SIP Books
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Session Initiation Protocol - SIP Book
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. $19.99 Printed, $16.99 eBook |
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