"Movement of Enhancing Opportunities and Improving Technology", abbreviated as Fatih, is among the most important educational projects in Turkey, in which students and teachers can use their tablet PCs to obtain educational data (text, images, media, etc.) stored in cloud servers. However, given the large number of users along with vast amount of educational data to be accessed, traffic overload and ineffective signaling protocols to manage connection and synchronization are the potential problems in Fatih project. To provide possible solution to this, we propose to employ proxy server at school level. A signaling protocol that provides connection mechanism and synchronization between tablet-proxy server and tablet-cloud server, and that meets cloud-based SaaS (Software as a service) in this architecture is necessary. In this paper, signaling protocols such as XMPP (Extensible Messaging and Presence Protocol), SIP (Session Initiation Protocol), and ARCSPXP (ARDIC Cloud Service Platform Extension Protocol) are reviewed and compared for their feasibility of employing in this school level proxy server based architecture.