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Scalable and efficient QoS support for SIP‐signalled voice calls
Author(s) -
Molina Maurizio,
Quittek Jürgen,
Brunner Marcus,
Melia Telemaco
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.794
Subject(s) - computer science , scalability , voice over ip , computer network , bandwidth (computing) , quality of service , session initiation protocol , sip trunking , provisioning , distributed computing , server , operating system , the internet
Abstract This paper proposes an extension of the functionality of a SIP proxy server for providing QoS to SIP‐signalled voice over IP calls in a scalable and efficient way. The basic concept lies in aggregating SIP calls into bandwidth‐provisioned trunks and on admitting calls on trunks only within the limit of their bandwidth. The SIP proxy server derives bandwidth requirements of SIP calls directly from parsed SIP messages. The bandwidth of the logical trunks can be dynamically changed. With a moderate trunk over‐sizing, the trunk resizing rate can be kept much lower than the call arrival process. The approach scales well in a scenario where a centralized entity (bandwidth broker) is in charge of managing all the trunks of a given domain. We present simulation results that confirm this good scalability. The functionality and scalability of the proposed approach is compared with other ones currently discussed in the IETF or in the literature. Copyright © 2006 John Wiley & Sons, Ltd.