Research And Implementation Of Key Technologies For Dual Stack VoIP Gateway

Due to the rapid development of computer and broadband network technology, the information transferred by Internet is converting from simple text to multimedia content, such as voice and video. Contributed to its low price and tremendous advantages compared with PSTN, VoIP has become one of the aims of NGN. What this thesis researches is how to provide ordinary families with high performing and convenient VoIP solutions. This dual stack VoIP Gateway designed by this thesis provides RJ11, used to connect POTs, and RJ45, used to connect ADSL or LAN, so, telephone calls can be conducted directly or through Gatekeeper.When voice data are carried on IP network, there are two steps; one is to set up the session, and the other is to transfer media across the network. Arround theses, following several explanations of the basis of VoIP, comparation of different solutions, and the choose of H.323 as well as SIP as the stacks, this thesis introduces hardware platform based on ARM, and illustrates software based on VxWorks, including software architecture, FSM, voice module, and other assistant functions.It is tested that the dual stack VoIP Gateway designed in this thesis performs well and has good voice quality.