Premium
Call admission control for voice over IP
Author(s) -
Uzunalioglu Huseyin,
J. Houck David,
T. Wang Y.
Publication year - 2006
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.783
Subject(s) - voice over ip , computer science , computer network , public switched telephone network , quality of service , softswitch , blocking (statistics) , call blocking , telephone network , router , call control , call admission control , internet protocol , telephony , admission control , scheme (mathematics) , the internet , telecommunications , telephone line , mobile radio telephone , mathematical analysis , wireless network , mathematics , world wide web , wireless
Voice over Internet protocol (VoIP) is a technology that enables the transmission of voice over an IP network. Recent years have witnessed heavy investment in this area in the commercial world. For VoIP to replace Public Switched Telephone Network (PSTN), it should provide voice quality comparable to circuit‐switched PSTN networks. This paper addresses the mechanisms to guarantee VoIP quality of service (QoS). The focus is given to the call admission control, which blocks voice calls when the required resources are not available to guarantee the QoS for the call. We review call admission control approaches that can be applied to VoIP, and describe the advantages and disadvantages of each approach. In the second part of the paper, we present a measurement‐based admission control scheme that achieves QoS in an efficient and scalable manner. The scheme uses voice traffic load measurements at each router link to compute link‐level blocking policies for new call attempts. Then, these policies are translated into path‐level blocking policies, which are applied to new call set‐up requests. The performance of the scheme is presented for single and multiple‐priority voice calls. Copyright © 2006 John Wiley & Sons, Ltd.