AudioCodes Mediant 4000 SBC User Manual page 9

User's Manual
20.1.1 Supported Audio Coders .......................................................................................411
20.1.2 Configuring Various Codec Attributes ...................................................................413
20.2 Configuring Allowed Audio Coder Groups ........................................................... 414
20.3 Configuring Allowed Video Coder Groups ........................................................... 417
20.4 Configuring IP Profiles ......................................................................................... 418
Session Border Controller Application................................................................449
21 SBC Overview .................................................................................................. 451
21.1 Feature List .......................................................................................................... 451
21.2 B2BUA and Stateful Proxy Operating Modes ...................................................... 452
21.3 Call Processing of SIP Dialog Requests .............................................................. 455
21.4 User Registration ................................................................................................. 457
21.4.1 Initial Registration Request Processing .................................................................457
21.4.2 Classification and Routing of Registered Users ....................................................458
21.4.3 General Registration Request Processing ............................................................459
21.4.4 Registration Refreshes ..........................................................................................459
21.4.5 Registration Restriction Control .............................................................................460
21.4.6 Deleting Registered Users .....................................................................................460
21.5 Media Handling .................................................................................................... 460
21.5.1 Media Anchoring ....................................................................................................461
21.5.2 Direct Media ...........................................................................................................462
21.5.3 Restricting Audio Coders .......................................................................................464
21.5.4 Coder Transcoding ................................................................................................465
21.5.5 Transcoding Mode .................................................................................................468
21.5.6 Prioritizing Coder List in SDP Offer .......................................................................468
21.5.7 SRTP-RTP and SRTP-SRTP Transcoding ...........................................................469
21.5.8 Multiple RTP Media Streams per Call Session .....................................................469
21.5.9 Interworking Miscellaneous Media Handling .........................................................470
21.5.9.1 Interworking DTMF Methods ................................................................. 470
21.5.9.2 Interworking RTP Redundancy ............................................................. 470
21.5.9.3 Interworking RTP-RTCP Multiplexing ................................................... 471
21.5.9.4 Interworking RTCP Attribute in SDP ..................................................... 471
21.5.9.5 Interworking Crypto Lifetime Field ......................................................... 471
21.5.9.6 Interworking Media Security Protocols .................................................. 471
21.5.9.7 Interworking ICE Lite for NAT Traversal ............................................... 471
21.6 Fax Negotiation and Transcoding ........................................................................ 471
21.7 Limiting SBC Call Duration ................................................................................... 472
21.8 SBC Authentication .............................................................................................. 472
21.8.1 SIP Authentication Server Functionality ................................................................472
21.8.2 User Authentication based on RADIUS .................................................................473
21.9 Interworking SIP Signaling ................................................................................... 474
21.9.1 Interworking SIP 3xx Redirect Responses ............................................................474
21.9.1.1 Resultant INVITE Traversing Device .................................................... 474
21.9.1.2 Local Handling of SIP 3xx ..................................................................... 475
21.9.2 Interworking SIP Diversion and History-Info Headers ...........................................476
21.9.3 Interworking SIP REFER Messages ......................................................................476
21.9.4 Interworking SIP PRACK Messages .....................................................................477
21.9.5 Interworking SIP Session Timer ............................................................................477
21.9.6 Interworking SIP Early Media ................................................................................477
21.9.7 Interworking SIP re-INVITE Messages ..................................................................480
21.9.8 Interworking SIP UPDATE Messages ...................................................................480
Version 7.2 9
Contents
Mediant 4000 SBC