Abstract: In order to realize communication fusion among mine-used IP communication terminals, a protocol stack used in mine communication terminal based on SIP was designed. Structure and specific design scheme of the protocol stack were introduced. The protocol stack has SIP syntax analysis module, SIP semanteme analysis module and media process module, which can realize calling building and management of mine SIP communication terminals based on IP network. The test results show that the protocol stack can interactively communication with different SIP terminals, and has all normal SIP calling management functions, which meets requirement of mine-used VOIP communication.