No abstract

Currently, text communication cannot be used to ask for help in emergency situations. Even in the Next Generation 9-1-1 system, an IP/SIP-based emergency communication system, there has been no investigation into how text communications such as Instant Messaging (IM) and Short Message Service (SMS) can be integrated. We identify the technical challenges in the integration of IM and SMS networks with the NG9-1-1 system, and propose a solution for each challenge. We also describe a working prototype system using our approach.

Abstract-Cloud computing is great for scaling applications but the latency in a guest VM can be unpredictable due to resource contention between neighbors. For telephony applications, which are latency-sensitive, we propose a system to monitor telephony server latencies and adapt the server load based on the measured latencies. We implemented the system and evaluated it on an Amazon EC2 testbed. We show indirectly by comparing our server on EC2 and on a local VM, that there may be contention between EC2 VMs in the wild that leads to higher server latency. While there is some overhead due to constant monitoring of the server, our system manages to lower latency by reducing the load to the server.

No abstract

One of the features of cloud computing platforms is the ability to scale applications dynamically. Generally, this feature is used in a web services context where the web service provider adds more web servers during times of high traffic and remove web servers during time of low traffic. Real-time communications service providers can also benefit from such feature. In this project, we propose and implement a highly scalable SIP proxy architecture that utilizes dynamic scalability. An evaluation of dynamic scalability of a part of the system is presented as well.