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Session Initiation Protocol - SIP Book
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Registrar ServerA registrar is a server that accepts registrations from users and places these registrations, (which is essentially location information), in a database known as a location service. The process of registration associates a user with a particular location, (IP address); this association is known as a 'binding' in SIP. When there is an incoming session for a user within a domain, the proxy server will interrogate the location server to determine the route for the signaling messages.
SIP Registrar Operation
This figure shows how a SIP Registrar that is used to gather and store registration data into a database to provide Location Service. In this example, an Internet telephone user agent is connected to the Internet. The Internet telephone had been previously programmed to register with a specific registrar service on the detection of new service (sensing an Internet connection). When the Internet telephone sends its registration information to the registrar (with its dynamically assigned IP address), the registrar updates the Location Service database to allow calls to be routed correctly for SIP communication sessions.
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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