Implementation and Optimization of H.323 Protocol Application for Embedded VoIP Phone

Abstract

VoIP is an emerging technology. Voice over Internet Protocol (also called VoIP, IP Telephony, Internet Telephony and Digital Phone) is the routing of voice conversations over the Internet or any other IP-based network. The voice data flows over a general purpose packet-switched network instead of traditional dedicated circuit-switched voice transmission lines. Protocols used to carry voice signals over the IP network are commonly referred to as Voice over IP or VoIP Protocols. The examples of VoIP protocols are SIP, H.323, MGCP and Megaco. H.323 is a popular VoIP protocol that was originally designed for multimedia communication. The H.323 standard provides a foundation for audio, video, and data communications across IP-based networks. My project work has been completed at NirmaLabs, the most recent initiative of Nirma Education and Research Foundation – NERF, an incubator to spawn High Tech Knowledge based Wealth Generation ventures. As the part of Project VoIP which was commenced at NirmaLabs, the task of developing optimized H.323 Protocol Application for ARM based VoIP Phone was assigned to me. Optimization can be performed due to the memory constraints on any Embedded VoIP Phone. The Optimized version of H.323 Protocol Application has been developed for both x86 and ARM platforms. Debugging and profiling have been completed in order to trace the flow of the application. For x86 platforms, the full featured H.323 enabled soft phone, having the Gatekeeper support has been developed. It has been tested and deployed successfully in the LAN environment. For ARM target, two optimized C libraries namely uClibc and Glibc were used. TS-7250 Development Board having ARM920T processor was used for the testing purpose. The signaling of H.323 Protocol Application has been tested on TS-7250 Development Board.