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With the size and increasing complexity of telecom networks, there is a need to interconnect management systems at different levels. This requires information flow across many applications in a domain independent way. XML is a widely deployed standard which is being used for integration of network management system(NMS) with other applications. We examine the performance of different transport mechanisms, JMS, CORBA, HTTP and RMI for an XML message based event Notification Service. To improve the performance of XML message based event notifications, event grouping is examined and is found to perform well.