Abstract
The paper is dedicated to mechanisms for open
 access to resource management in the Internet Protocol (IP)
 multimedia networks. First we present the concept of IP
 Multimedia Subsystem (IMS) and explain the IMS functional
 architecture, principles of quality of service management and
 service control in IMS. Then we describe the idea behind the
 opening of network interfaces for third parties so that others
 besides the network operator can create and deploy services.
 Open Service Access (OSA) and Parlay appear to be the
 technologies for value-added service delivery in multimedia
 networks. In the paper we take a closer look to the
 Parlay/OSA interfaces that allow third party applications to
 access the resource management functions in IMS. OSA
 "Connectivity Manager" interfaces and OSA "Policy
 Management" interfaces are considered. Parlay X Web
 Services interfaces provide a higher level of abstraction than
 Parlay/OSA interfaces and gain an amazing amount of
 support among service developers. We address "Applicationdriven Quality of Service" Parlay X Web Service and
 "Policy" Parlay X Web Service also.
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