Tool assisted H.323 dial-plan design following formally defined strategies

Knezevic, M; Stassinopoulos, G

dc.contributor.author	Knezevic, M	en
dc.contributor.author	Stassinopoulos, G	en
dc.date.accessioned	2014-03-01T01:25:24Z
dc.date.available	2014-03-01T01:25:24Z
dc.date.issued	2006	en
dc.identifier.issn	1074-5351	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17653
dc.subject	Dial plan	en
dc.subject	H.323	en
dc.subject	ISDN	en
dc.subject	Resource availability indicator	en
dc.subject	Voice over IP	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.classification	Telecommunications	en
dc.subject.other	Dial plan	en
dc.subject.other	H.323	en
dc.subject.other	Resource availability indicators	en
dc.subject.other	Voice over IP	en
dc.subject.other	Algorithms	en
dc.subject.other	Internet	en
dc.subject.other	Optimization	en
dc.subject.other	Resource allocation	en
dc.subject.other	Routers	en
dc.subject.other	Speech communication	en
dc.subject.other	Telecommunication networks	en
dc.subject.other	Virtual reality	en
dc.subject.other	Voice/data communication systems	en
dc.subject.other	Network protocols	en
dc.title	Tool assisted H.323 dial-plan design following formally defined strategies	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/dac.760	en
heal.identifier.secondary	http://dx.doi.org/10.1002/dac.760	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	This paper considers H.323 v4 VoIP networks consisting of gateways and gatekeepers, addressing the task of terminating calls to multiple ISDN networks. Our goal is the maximal utilization of the gatekeeper's centralized routing mechanism for call termination to ISDN networks based on load balancing and resource availability indication (RAI), thus minimizing the need for usage of unwanted (second attempt) overflow mechanisms. We elaborate on the drawbacks of overflow mechanisms and give an overview on different solutions offered in practice by vendors. The discussion justifies the emphasis on load balancing, thus we present an algorithm and tool assisted approach for the systematic assignment of PRIs from ISDN networks to gateways. We follow strictly defined design criteria that lead to an optimized network dial-plan. We thus offer a stand alone, off-line solution without the need of any extra add-ons or upgrades. This is intended to replace the purely intuitive approach followed by today's planners. Our scope is the design rather than the runtime environment; the latter continues to feature the simplicity of a single global RAI per gateway. We consider desirable and non-desirable link distribution topologies between gateways and ISDN networks based on operational and economic evaluation criteria. These measure the number of 'wasted' gateway ports or 'inappropriately' allocated network interfaces. Our approach is illustrated through a worked out example showing key features of the proposed algorithm and revealing characteristic cases met in the ISDN interface allocation. Finally, we show how the presented methodology, which presently addresses a H.323 design issue, can provide performance benefits in the VoIP technologies of the immediate future. Copyright © 2005 John Wiley & Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	International Journal of Communication Systems	en
dc.identifier.doi	10.1002/dac.760	en
dc.identifier.isi	ISI:000238703000005	en
dc.identifier.volume	19	en
dc.identifier.issue	5	en
dc.identifier.spage	585	en
dc.identifier.epage	602	en