Abstract
The IP Multimedia Subsystem (IMS) is an architecture for supporting multimedia services via a Session Initiation Protocol (SIP) infrastructure. IMS, specified by the 3rd Generation Partnership Project (3GPP), is increasingly adopted as the reference multimedia network architecture by providers of wireline and wireless infrastructure and associated multimedia application services. One of the characteristics of the IMS architecture is that many different and mandatory SIP proxies are used for each end-to-end SIP session. This may adversely impact the overall IMS call processing performance, which is already affected by the universal usage of SIP. This also makes each end-to-end SIP session dependent on the good functioning of many hosts, which decreases reliability while increasing significantly the end-to-end message latency. This paper analyzes the performance and quantifies the benefits of having the SIP servers running on the same host. It then explains which types of SIP calls in the IMS network can benefit from the co-location of IMS servers and shows how to design the IMS network to maximize IMS server co-location. Finally, it introduces Lucent Technologies' SIPia BUS software architecture, which implements the co-location capability by introducing a new SIP transport in a way that is both natural and non-disruptive for the SIP stack and the SIP user agent.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
