Voip Internet Technology Research And Analysis

Voip technology is based on many fields including: Computer Network, Signaling Protocol, DSP, etc. As a very important technology, the standard protocol architecture for Voip is still in progress. Now the prevailing protocol suites includes: H.323 from ITU-T, SIP from IETF and MEGACO/H.248 from both. Today the main commercial implementation of Voip is the version of "PSTN-IP-PSTN": Users still call everyone by their traditional phone, while the actual change lies in internal backbone of the network. There are also some cases invoking true Voip termainal, however, mainly in enterprise applications. They are based on different devices from different vendors, lacking of direct communication among these Voip areas. With the fast-developing Voip technology and the increasing number of users, we are bound to provide global addressing service, which is ignored when early implementation. This is also the research direction of this essay.The background, features and prevailing protocol suites of Voip are first discussed by this thesis. Then the section in succession is used to analyze different signaling models of Voip, thus to emphasize the importance of inter-communication of different Voip areas. There are mainly two parts of Voip inter-communication technology: name addressing mechanism and policy routing mechanism. Due to the hierarchical structure of Voip's name space, we come up with a set of query procedures based on new DNS technologies. Finally more attention is paid to TRIP protocol: background, functionality and details. We compare TRIP to other network routing protocol such as OSPF, then analyze the architecture of TRIP deployment, and discuss possible problems of implementation. Based on author's experience in implementing OSPF protocol, solutions for these problems are brought forward.