1 <body> 2 This package implements the main protocol abstractions that are defined by the SIP RFC 3261. 3 These 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 10 SIPTransactionStack is the container that holds references to these protocol objects. 11 12 </body> 13