IETF RFC 3263 PDF

Rosenberg Request for Comments: dynamicsoft Obsoletes: H. Please refer to the current edition of the "Internet Official Protocol Standards" STD 1 for the standardization state and status of this protocol. Distribution of this memo is unlimited. All Rights Reserved. It also uses DNS to allow a server to send a response to a backup client if the primary client has failed.

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Google Network Working Group J. Rosenberg Request for Comments: dynamicsoft Obsoletes: H. Please refer to the current edition of the "Internet Official Protocol Standards" STD 1 for the standardization state and status of this protocol. Distribution of this memo is unlimited.

All Rights Reserved. It also uses DNS to allow a server to send a response to a backup client if the primary client has failed. This document describes those DNS procedures in detail. Table of Contents 1 Introduction SIP end systems are called user agents, and intermediate elements are known as proxy servers.

To do so, it communicates with proxy 1 in its domain domain A. Proxy 1 forwards the request to the proxy for the domain of the called party domain B , which is proxy 2. Proxy 2 forwards the call to the called party, UA 2.

As part of this call flow, proxy 1 needs to determine a SIP server for domain B. The first is for proxy 1 to discover the SIP server in domain B, in order to forward the call for joe B. The second is for proxy 2 to identify a backup for proxy 1 in the event it fails after forwarding the request. For the first aspect, proxy 1 specifically needs to determine the IP address, port, and transport protocol for the server in domain B. The choice of transport protocol is particularly noteworthy.

Thus, clients need to be able to automatically determine which transport protocols are available. The proxy sending the request has a particular set of transport protocols it supports and a preference for using those transport protocols. Proxy 2 has its own set of transport protocols it supports, and relative preferences for those transport protocols. Some form.

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IETF RFC 3263 PDF

Rosenberg Request for Comments: dynamicsoft Obsoletes: H. Please refer to the current edition of the "Internet Official Protocol Standards" STD 1 for the standardization state and status of this protocol. Distribution of this memo is unlimited. All Rights Reserved. Abstract This document defines a mechanism by which two entities can make use of the Session Description Protocol SDP to arrive at a common view of a multimedia session between them. In the model, one participant offers the other a description of the desired session from their perspective, and the other participant answers with the desired session from their perspective.

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Schulzrinne Columbia U. June Reliability of Provisional Responses in the Session Initiation Protocol SIP Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" STD 1 for the standardization state and status of this protocol. Distribution of this memo is unlimited. All Rights Reserved. Table of Contents 1 Introduction

IEC 60688 PDF

Goll The necessity in the IMS of reserving resources to provide quality of service QoS leads to another security issue: The extension for service route discovery during registration [31] consists of a Service-Route header field that is used by the registrar in a 2XX response to a REGISTER request to inform the registering user of the entity that must forward every request originated by him or her. In the IMS context, there are certain rvc entities i. Retrieved December 1, SIP is ketf exceptionally popular and extensible protocol. Moreover, there is also a mechanism for conditional event notification that allows the notifier to decide whether or not to send the complete Idtf message depending on if there is something new to notify since last subscription or there is not. A typical use of this mechanism is call transfer: Comments on RFCs and corresponding changes are accommodated through the existing standardization process. The degree of stability or maturity of the document:.

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Worley, Ed. It represents the consensus of the IETF community. Johansson, et al. All rights reserved. Please review these documents carefully, as they describe your rights and restrictions with respect to this document.

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