Services for internet telephony
Services for internet telephony
Characterizing session initiation protocol (SIP) network performance and reliability
ISAS'05 Proceedings of the Second international conference on Service Availability
Megaco/H.248: a new standard for media gateway control
IEEE Communications Magazine
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In recent years, Internet Protocol (IP) telephony has become a good alternative to the traditional Public Switched Telephone Networks (PSTN). IP telephony offers more flexibility in the implementation of new features and services. The Media Gateway Controller (MEGACO) is becoming a popular signalling protocol for Voice over IP (VoIP) based applications. This paper analyzes performance of MEGACO model (Media Gateway Controller for Telephones) based on COPS (Common Open Policy Server) which is a protocol defined in IETF (Internet Engineering Task Force) to transport configuration requests and deliver the policies. There is a basic "request response" protocol for the policy and information exchange, the COPS protocol buffer can be divided into three distinct conceptual layers: basic protocol, directives depending on the customer type and the representation of the policy data; moreover, MGC provides call control function of MG (Media Gateway) to set up, tear down and manage VoIP calls in carrier class VoIP network. In this paper, we simulated the M/M/1 performance model of the Media Gateway Controller and studied some of the key performance benchmarks response time to process the MEGACO calls and mean number of MEGACO calls in the system; therefore, we have used these criteria by queuing theory. Numbers of jobs based on variation service rate are presented beside some numerical examples of call setup time based on variation service rate.