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Contents
1 INTRODUCTION .......................................................................3
1.1 BACKGROUND .............................................................................3
2 SYSTEM OVERVIEW................................................................4
2.1 THE FAX OVER IP SOLUTION.........................................................4
2.2 VOIP NETWORK ...........................................................................5
2.2.1 SIP Server..................................................................................5
2.2.2 PSTN Gateway ..........................................................................5
2.2.3 Session Border Controller (SBC)...............................................6
2.3 FAX CALL SETUP .........................................................................6
2.4 T.38 AND T30 PROTOCOL ............................................................7
2.5 ACCESS NETWORK ......................................................................7
3 ERICSSON W25........................................................................8
3.1 SIGNALING...................................................................................8
3.1.1 Details over the SIP Implementation..........................................8
3.2 SECURITY....................................................................................8
3.3 MEDIA STREAM............................................................................8
3.3.1 Jitter Buffer.................................................................................8
3.3.2 Echo Canceller...........................................................................9
3.3.3 QoS............................................................................................9
3.4 INTEROPERABILITY.......................................................................9
4 W25 CONFIGURATION ..........................................................10
4.1 FAX SERVICE .............................................................................10
4.1.1 IMS User Agent........................................................................10
4.1.2 IMS Call Server........................................................................11
4.1.3 IMS Media Codec ....................................................................12
4.1.4 VoIP timer ................................................................................14
5 REFERENCES ........................................................................15
6 ACRONYMS AND ABBREVIATIONS.....................................16
7 APPENDIX A...........................................................................17
2 2/221 02-FGB 101 327 Uen B – November 2007