After analyzing the PINT service protocol and the SIP/SDP protocol,with the implement of a CTD (Click to Dial) system, the PINT service protocol FSM and an object-oriented implement method are presented.

• 本文在分析了PINT业务协议以及SIP/SDP协议的基础上 ,结合点击拨号业务给出了PINT业务协议的有限状态机 ,并利用面向对象的方法实现了协议的主要功能