Notes for the next version: 1. Add AddressFactory.createAddress() ( no args ). 2. Intoduce AddressParametersHeader interface (SIP Servlets implementation support). 3. Respose.getStatusLine() returns the status line of the response ( useful for REFER NOTIFICATIONS ). Note that all the Extension classes (ending with Ext ) can be used as they will be included in the next JAIN-SIP API.