User's Manual 12 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
28 SBC Overview .................................................................................................. 605
28.1 Feature List .......................................................................................................... 605
28.2 B2BUA and Stateful Proxy Operating Modes ...................................................... 606
28.3 Call Processing of SIP Dialog Requests .............................................................. 609
28.4 User Registration ................................................................................................. 611
28.4.1 Initial Registration Request Processing .................................................................611
28.4.2 Classification and Routing of Registered Users ....................................................612
28.4.3 General Registration Request Processing ............................................................613
28.4.4 Registration Refreshes ..........................................................................................613
28.4.5 Registration Restriction Control .............................................................................614
28.4.6 Deleting Registered Users .....................................................................................614
28.5 Media Handling .................................................................................................... 614
28.5.1 Media Anchoring ....................................................................................................615
28.5.2 Direct Media ...........................................................................................................616
28.5.3 Restricting Audio Coders .......................................................................................618
28.5.4 Coder Transcoding ................................................................................................619
28.5.5 Transcoding Mode .................................................................................................623
28.5.6 Prioritizing Coder List in SDP Offer .......................................................................623
28.5.7 SRTP-RTP and SRTP-SRTP Transcoding ...........................................................624
28.5.8 Multiple RTP Media Streams per Call Session .....................................................624
28.5.9 Interworking Miscellaneous Media Handling .........................................................624
28.5.9.1 Interworking DTMF Methods ................................................................. 625
28.5.9.2 Interworking RTP Redundancy ............................................................. 625
28.5.9.3 Interworking RTCP Attribute in SDP ..................................................... 625
28.5.9.4 Interworking Crypto Lifetime Field ......................................................... 625
28.6 Fax Negotiation and Transcoding ........................................................................ 626
28.7 Limiting SBC Call Duration ................................................................................... 626
28.8 SBC Authentication .............................................................................................. 627
28.8.1 SIP Authentication Server Functionality ................................................................627
28.8.2 User Authentication based on RADIUS .................................................................628
28.9 Interworking SIP Signaling ................................................................................... 628
28.9.1 Interworking SIP 3xx Redirect Responses ............................................................628
28.9.1.1 Resultant INVITE Traversing Device .................................................... 628
28.9.1.2 Local Handling of SIP 3xx ..................................................................... 630
28.9.2 Interworking SIP Diversion and History-Info Headers ...........................................630
28.9.3 Interworking SIP REFER Messages ......................................................................631
28.9.4 Interworking SIP PRACK Messages .....................................................................631
28.9.5 Interworking SIP Session Timer ............................................................................632
28.9.6 Interworking SIP Early Media ................................................................................632
28.9.7 Interworking SIP re-INVITE Messages ..................................................................634
28.9.8 Interworking SIP UPDATE Messages ...................................................................634
28.9.9 Interworking SIP re-INVITE to UPDATE ................................................................635
28.9.10 Interworking Delayed Offer ....................................................................................635
28.9.11 Interworking Call Hold ............................................................................................635
28.9.12 Interworking SIP Via Headers ...............................................................................636
28.9.13 Interworking SIP User-Agent Headers ..................................................................636
28.9.14 Interworking SIP Record-Route Headers ..............................................................636
28.9.15 Interworking SIP To-Header Tags in Multiple SDP Answers ................................636
28.9.16 Interworking In-dialog SIP Contact and Record-Route Headers ...........................636
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