| Nowadays, with the rapid development of computer and communications technology, the digital and intelligent products are gradually going into people’s lives. Digital products can be seen everywhere in daily life and the community access intercom system is also a general trend of the figure. Community access intercom system up to date are very strong on their functions. However, there are still some drawbacks. A stable, safe, practical, standard, open network of digital intelligent system will be the development direction of this industry.In this paper, a solution of a SIP-based access intercom terminal software was proposed corresponding to the development direction and the current status. The article studied the SIP architecture, the SIP protocol message’s form, the SIP elementary operation, the SIP call flow, the SDP protocol, the RTP protocol and the RTCP protocol in details. On this basis, combined with SIP workflow, the existing functions and drawbacks, this paper designed and implemented access intercom terminal software. In the design processing the open-source software Linphone’s methods of design were referenced. At last, the terminal software was all-digital and overcome some of the drawbacks of existing terminal. Finally, the terminal software has been tested and analyzed. |
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