Services for internet telephony
Services for internet telephony
SIP: Understanding the Session Initiation Protocol, Second Edition
SIP: Understanding the Session Initiation Protocol, Second Edition
Service oriented computing: enabling cross-network services between the internet and the telecommunications network
Modeling and Optimization for the Design of IMS Networks
ANSS '06 Proceedings of the 39th annual Symposium on Simulation
Measurements and Analysis of M/M/1 and M/M/c Queuing Models of the SIP Proxy Server
ICCCN '09 Proceedings of the 2009 Proceedings of 18th International Conference on Computer Communications and Networks
Characterizing session initiation protocol (SIP) network performance and reliability
ISAS'05 Proceedings of the Second international conference on Service Availability
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In recent years, Internet Protocol (IP) telephony has been a real alternative to the traditional Public Switched Telephone Networks (PSTN). IP telephony offers more flexibility in the implementation of new features and services. The Session Initiation Protocol (SIP) is becoming a popular signalling protocol for Voice over IP (VoIP) based applications. The SIP proxy server is a software application that provides call routing services by parsing and forwarding all the incoming SIP packets in an IP telephony network. The efficiency of this process can create large scale, highly reliable packet voice networks for service providers and enterprises. We established that the efficient design and implementation of the SIP proxy server architecture can enhance the performance characteristics of a SIP proxy server significantly. Since SIP proxy server performance can be characterised by its transaction states of each SIP session, we emulated the M/M/1 performance model of the SIP proxy server and studied some of the key performance benchmarks such as average response time to process the SIP calls, and mean number of SIP calls in the system. We showed its limitations, and then studied an alternative M/M/c based SIP proxy server performance model with enhanced performance model and studied additional key performance characteristics such as server utilisation, queue size and memory utilisation. Provided the comparative results between the predicted results with the experimental results conducted in a lab environment.