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An Implementation of Embedded SIP User Agent under Wireless LAN Area  

Park Seung-Hwan (국립한밭대학교)
Lee Jae-Heung (국립한밭대학교)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.9, no.3, 2005 , pp. 493-497 More about this Journal
Abstract
This paper is about the research of the User Agent implementation under wireless embedded environment, using SIP which is one of protocol components construct the VoIP system. The User Agent is made of the User Agent configuration block, the device thread block to control devices and the SIP stack block to process SIP messages. The device thread consists of the RTP thread and the sound lard device processing block. Futhermore, the SIP stack consist of the worker thread to process proxy events, the SIP transceiver and SIP thread to transfer and receive SIP messages. The H/W platform is a board included the Intel's XScale PXA255 processor, flash memory, SDRAM, Audio CODEC module and wireless LAN threough PCMCIA socket, furthermore a microphone and headphone is used by the audio 1/0. The system has embedded linux kernel 2.4.19. For embedded environment, the function of User Agent and SIP method is diminished. Finally, the resource of system could be reduced about $12.9\%$, compared to overall system resource, by minimizing peripherals control and excepting TCP.
Keywords
VoIP; SIP; Embedded; User Agent; Xscale;
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