29.14.1.3 DID Wink ............................................................................................... 413
29.14.2 FXO Operations for Tel-to-IP Calls ........................................................................414
29.14.2.1 Automatic Dialing .................................................................................. 414
29.14.2.2 Collecting Digits Mode........................................................................... 415
29.14.2.3 FXO Supplementary Services ............................................................... 415
29.14.3 Call Termination on FXO Devices .........................................................................416
29.14.3.1 Calls Termination by PBX ..................................................................... 416
29.14.3.2 Call Termination before Call Establishment .......................................... 417
29.14.3.3 Ring Detection Timeout ......................................................................... 417
29.15 Remote PBX Extension between FXO and FXS Devices .................................... 417
29.15.1 Dialing from Remote Extension (Phone at FXS) ...................................................418
29.15.2 Dialing from PBX Line or PSTN .............................................................................418
29.15.3 Message Waiting Indication for Remote Extensions .............................................419
29.15.4 Call Waiting for Remote Extensions ......................................................................419
29.15.5 FXS Gateway Configuration ..................................................................................420
29.15.6 FXO Gateway Configuration ..................................................................................421
Session Border Controller Application................................................................423
30 SBC Overview .................................................................................................. 425
30.1 SIP Network Definitions ....................................................................................... 426
30.2 SIP Dialog Initiation Process ................................................................................ 426
30.3 User Registration and Internal Database ............................................................. 428
30.3.1 Initial Registration Request Processing .................................................................429
30.3.2 Internal Database ..................................................................................................429
30.3.3 Routing using Internal Database ...........................................................................430
30.3.4 Registration Refreshes ..........................................................................................430
30.3.5 Notification of Expired User Registration to SIP Proxy / Registrar ........................430
30.3.6 Registration Restriction Control .............................................................................431
30.4 SBC Media Handling ............................................................................................ 431
30.4.1 Media Anchoring without Transcoding (Transparent) ...........................................433
30.4.2 Media Anchoring with Transcoding .......................................................................433
30.4.3 No Media Anchoring ..............................................................................................435
30.4.4 Transcoding Modes ...............................................................................................437
30.4.5 Restricting Coders .................................................................................................437
30.4.6 Coder Transcoding ................................................................................................438
30.4.7 Prioritizing Coder List in SDP Offer .......................................................................439
30.4.8 SRTP-RTP and SRTP-SRTP Transcoding ...........................................................439
30.4.9 Multiple RTP Media Streams per Call Session .....................................................440
30.4.10 Interworking DTMF Methods .................................................................................440
30.5 Fax Negotiation and Transcoding ........................................................................ 441
30.6 Limiting SBC Call Duration ................................................................................... 441
30.7 SIP Authentication Server for SBC Users ............................................................ 441
30.8 Interworking SIP Signaling ................................................................................... 442
30.8.1 Interworking SIP 3xx Redirect Responses ............................................................442
30.8.1.1 Resultant INVITE Traversing Device .................................................... 442
30.8.1.2 Local Handling of SIP 3xx ..................................................................... 444
30.8.2 Interworking SIP Diversion and History-Info Headers ...........................................444
30.8.3 Interworking SIP REFER Messages ......................................................................445
30.8.4 Interworking SIP PRACK Messages .....................................................................445
30.8.5 Interworking SIP Session Timer ............................................................................446
30.8.6 Interworking SIP Early Media ................................................................................446
30.8.7 Interworking SIP re-INVITE Messages ..................................................................448
30.8.8 Interworking SIP UPDATE Messages ...................................................................448
30.8.9 Interworking SIP re-INVITE to UPDATE ................................................................448
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