ZHANG Zhao-xin1, FANG Bin-xing1, ZHANG Hong-li1, et al. Safe communicated model of SIP network based on improved SIP protocol[J]. 2007, (12): 39-47.DOI:
digital certifi-cate and the characteristic of SIP network
the safe communicated model of SIP network based on improved SIP protocol was put forward.New call established protocol was constituted used the primary flow for reference
new register protocol and roam register protocol were constituted
time synchronization protocol and negotiating key protocol was added for this model
and test the safe communicated model in real circumstance.The result of the experiment proved that this model improved the confidentiality
integrality
usability
non-repudiation and novelty of the SIP network with the millisecond delay which can be accepted.