1<body> 2This package implements the main protocol abstractions that are defined by the SIP RFC 3261. 3These include the following main ones: 4<ul> 5<li>SIPServerTransaction -- an implementation of the Server Transaction State Machine (Chapter 17 of RFC 3261). 6<li>SIPClientTransaction -- an implementation of the Client Transction State Machine (Chapter 17 of RFC 3261). 7<li>SIPDialog -- an implementation of the SIP Dialog ( Chapter 11 of RFC 3261 ). 8</ul> 9 10SIPTransactionStack is the container that holds references to these protocol objects. 11 12</body> 13