Failover, load sharing and server architecture in SIP telephony
Computer Communications
A Case for High Availability in a Virtualized Environment (HAVEN)
ARES '08 Proceedings of the 2008 Third International Conference on Availability, Reliability and Security
Remus: high availability via asynchronous virtual machine replication
NSDI'08 Proceedings of the 5th USENIX Symposium on Networked Systems Design and Implementation
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SIP server clusters provide scalability and high availability for SIP applications. The nature of telecommunications services dictates requirements for these capabilities that generally exceed what is necessary in the domain of web applications. There are a number of clustering solutions available to address these requirements, but due to significant differences in architecture and the lack of common terminology, the solutions are difficult to compare. In this paper, we propose system requirements that are necessary to achieve scalability and high availability. We then propose an abstract cluster architecture containing four common architectural elements. Solutions from three different vendors are described in terms of these abstract elements. The solutions are compared based on an evaluation framework that includes a number of criteria, such as robustness to failures of different types and numbers, overhead required to manage failures, and scaling efficiency.