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Computer Networks
Volume 51, Issue 2, 7 February 2007, Pages 496-514
Feature Interaction
 
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doi:10.1016/j.comnet.2006.08.007    How to Cite or Link Using DOI (Opens New Window)
Copyright © 2006 Elsevier B.V. All rights reserved.

Policies and conflicts in call control

Kenneth J. Turnera, Corresponding Author Contact Information, E-mail The Corresponding Author and Lynne Blairb, 1, E-mail The Corresponding Author

aComputing Science and Mathematics, University of Stirling, Stirling FK9 4LA, United Kingdom bComputing, InfoLab 21, South Drive, Lancaster University, Lancaster LA1 4WA, United Kingdom

Responsible Editor: H. Rudin. 
Available online 20 September 2006.

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Abstract

Policy-based management is introduced and related to the specific needs of call control. It is explained how policies differ in important ways from features. Related work on policy-based management is reviewed, leading to the conclusion that a different approach is required for call control. A general architecture is presented for a policy system. This includes an overview of the major policy components, relating them to the system under control and to the context system that provides additional information.

As a framework for explaining how policy conflicts are handled, the policy language for call control is briefly presented along with some sample policies. The paper then focuses on how policy conflicts are defined and resolved, using sample resolutions to illustrate the approach. Pointers are given to future enhancements to policy support, including new applications of policies to novel domains.

Keywords: Call control; Internet telephony; Policy; Policy conflict

Article Outline

1. Introduction
1.1. Policy-based systems
1.2. Call control
1.3. Related work
1.4. Overview of paper
2. The policy system
2.1. Policy system architecture
2.2. Policy server
2.3. Policy wizard
2.4. System interface
2.5. Context system
2.6. Policy store
3. The policy language
3.1. Core language
3.2. Policy language for call control
3.3. Sample policies for call control
3.4. Policy language for call control conflict
3.4.1. Detecting conflicts
3.4.2. Resolving conflicts
3.5. Sample policies for call control conflict
4. Conclusions
Acknowledgements
References
Vitae






Computer Networks
Volume 51, Issue 2, 7 February 2007, Pages 496-514
Feature Interaction
 
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