Researches Of SIP Protocol Security Problems

The SIP one kind of emerging technology which develops based on the VoIP service, is one of important protocols in NGN (Next Generation Network), also was considered will be the session protocol of NGN and the future network. It is responsible under the Internet environment to establish and to manage session, is swiftly and violently speeding up the change of each organizations' communication nowadays. So it appears that the SIP secure researches are especially important.SIP is the mentality design which according to the simplification, easy to expand, but is not the basis safe mentality design. Therefore in SIP application security aspects, SIP has its own special characteristic. SIP is transmits by text form, simultaneously, because in the SIP application middle server needs to read in the SIP messages certain fields to gain the information to transmit the SIP package to the correct destination, therefore the SIP message body does not allow in middle server between transmission process completely to encrypt also is may revise as necessary. Moreover emerges gradually along with SIP, more and more manufacturers, user hope SIP support widespread function application in daily production and daily life. By now, the SIP security became the question which thorny might not avoid.Although the for many years whole world innumerable network security experts all have been concentrating on study the SIP security problem solution, but the result is not so far big, this article's research goal is each kind of safe threat which faces to the current SIP makes the detailed classified analysis. And aims at the classification threat model which proposed from SIP application each link to propose the one whole set of security countermeasure to a certain extent avoids or the alleviation existing safe threat by the time. In fact, any kind of safety mechanism which joins in the SIP agreement application all has the possibility to be able to reduce the SIP application the grade of service, also can affect the entire SIP support telephone conversation network efficiency. Therefore finally makes the corresponding analysis to the security countermeasure implementation to in the SIP application performance influence. In performance analysis process, not only has considered to the application QoS demands and the performance parameter, moreover also fully considered SIP during each entity Interoperability and the entire SIP application integrity. Make the overall system while to enhance secure not to lose the connection quality and the network transmission efficiency as far as possible. In guarantee greatest degree realization SIP conversation network security, stability and highly effective.At present, sets up the large-scale commercial VoIP long-distance service network using SIP, provides for the public has the grade of service guarantee long-distance pronunciation correspondence is SIP core duty. Future, SIP possibly will be able to provide the richer pronunciation increment service to the public, from the sole media correspondence to the multimedia correspondence development, will cause the system to become gradually may supervise and manage, but will monitor legitimately and so on. These all will be to the SIP agreement future happy forecast. Without a doubt is, SIP will already become one of next generation network medium-soft exchange core agreements, we believed, along with SIP correlation standard further perfect as well as domestic and foreign to SIP applied research further thorough, SIP will play the more and more major role in the next generation network protocol race.