{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,1,25]],"date-time":"2024-01-25T19:01:33Z","timestamp":1706209293717},"reference-count":10,"publisher":"IGI Global","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2019,1,1]]},"abstract":"<p>Various studies have suggested enhancing the performance of large-scale systems, such as mission critical communication systems (MCCSs). However, few have modelled and evaluated the performance of such systems in a way that targets overall system performance in real time. Moreover, it is not enough to define the Key Performance Indicators (KPIs) for a system without using them for system performance measurement and performance evaluation. The Session Initiation Protocol (SIP) and IP Multimedia Subsystem (IMS) both have a set of KPIs, such as the registration process delay, that can be used to measure and thus optimize overall system performance. This article articulates different options for system simulation and evaluation. The registration process affects performance and reflects the overall system performance. The article shows how the registration process is delayed and how the overall system scalability are negatively impacted by system overload.<\/p>","DOI":"10.4018\/ijicst.2019010102","type":"journal-article","created":{"date-parts":[[2018,12,21]],"date-time":"2018-12-21T14:29:58Z","timestamp":1545402598000},"page":"17-31","source":"Crossref","is-referenced-by-count":2,"title":["Scalability and Performance Analysis of SIP based Multimedia Services over Mission Critical Communication Systems"],"prefix":"10.4018","volume":"9","author":[{"given":"Ashraf A.","family":"Ali","sequence":"first","affiliation":[{"name":"University of South Wales, Pontypridd, UK; Hashemite University, Az-Zarqa, Jordan"}]},{"given":"Khalid","family":"Al-Begain","sequence":"additional","affiliation":[{"name":"Kuwait College of Science and Technology, Kuwait City, Kuwait"}]},{"given":"Andrew","family":"Ware","sequence":"additional","affiliation":[{"name":"Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, UK"}]}],"member":"2432","reference":[{"key":"IJICST.2019010102-0","author":"J. 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