Table of ContentsxiAppendix B: Time Zones ............................................................................................................. 229Appendix C: Configuration Parameters .................................................................................... 232Setting Parameters in Configuration Files .......................................................................... 232Basic and Advanced Parameters ....................................................................................... 232Audio Feature Parameters................................................................................................... 332Security Feature Parameters ............................................................................................... 339Upgrading the Firmware ..................................................................................................... 343Resource Files ....................................................................................................................... 345Troubleshooting .................................................................................................................... 350Configuring DSS Key ............................................................................................................ 351Appendix D: SIP (Session Initiation Protocol) ............................................................................ 364RFC and Internet Draft Support .......................................................................................... 364SIP Request ............................................................................................................................ 366SIP Header ............................................................................................................................ 366SIP Responses ....................................................................................................................... 368SIP Session Description Protocol (SDP) Usage .................................................................. 370Appendix E: SIP Call Flows ......................................................................................................... 371Successful Call Setup and Disconnect ............................................................................... 372Unsuccessful Call Setup—Called User is Busy .................................................................. 374Unsuccessful Call Setup—Called User Does Not Answer ................................................ 378Successful Call Setup and Call Hold .................................................................................. 381Successful Call Setup and Call Waiting ............................................................................. 383Call Transfer without Consultation ...................................................................................... 388Call Transfer with Consultation ............................................................................................ 392Always Call Forward ............................................................................................................ 398Busy Call Forward ................................................................................................................ 401No Answer Call Forward ..................................................................................................... 404Call Conference .................................................................................................................... 407Appendix F: Sample Configuration File .................................................................................... 412Index ......................................................................................419