User's Manual 12 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
28.13.3.2 Call Termination before Call Establishment .......................................... 631
28.13.3.3 Ring Detection Timeout ......................................................................... 631
28.14 Remote PBX Extension between FXO and FXS Devices .................................... 631
28.14.1 Dialing from Remote Extension (Phone at FXS) ...................................................632
28.14.2 Dialing from PBX Line or PSTN .............................................................................632
28.14.3 Message Waiting Indication for Remote Extensions .............................................633
28.14.4 Call Waiting for Remote Extensions ......................................................................634
28.14.5 FXS Gateway Configuration ..................................................................................634
28.14.6 FXO Gateway Configuration ..................................................................................636
Session Border Controller Application................................................................637
29 SBC Overview .................................................................................................. 639
29.1 Feature List .......................................................................................................... 639
29.2 B2BUA and Stateful Proxy Operating Modes ...................................................... 640
29.3 Call Processing of SIP Dialog Requests .............................................................. 643
29.4 User Registration ................................................................................................. 645
29.4.1 Initial Registration Request Processing .................................................................645
29.4.2 Classification and Routing of Registered Users ....................................................646
29.4.3 General Registration Request Processing ............................................................647
29.4.4 Registration Refreshes ..........................................................................................647
29.4.5 Registration Restriction Control .............................................................................648
29.4.6 Deleting Registered Users .....................................................................................648
29.5 Media Handling .................................................................................................... 648
29.5.1 Media Anchoring ....................................................................................................649
29.5.2 Direct Media ...........................................................................................................650
29.5.3 Restricting Audio Coders .......................................................................................652
29.5.4 Prioritizing Coder List in SDP Offer .......................................................................653
29.5.5 Multiple RTP Media Streams per Call Session .....................................................653
29.5.6 Interworking Miscellaneous Media Handling .........................................................653
29.5.6.1 Interworking RTP Redundancy ............................................................. 653
29.5.6.2 Interworking RTP-RTCP Multiplexing ................................................... 654
29.5.6.3 Interworking RTCP Attribute in SDP ..................................................... 654
29.5.6.4 Interworking Crypto Lifetime Field ......................................................... 654
29.5.6.5 Interworking Media Security Protocols .................................................. 654
29.5.6.6 Interworking ICE Lite for NAT Traversal ............................................... 654
29.6 Limiting SBC Call Duration ................................................................................... 654
29.7 SBC Authentication .............................................................................................. 655
29.7.1 SIP Authentication Server Functionality ................................................................655
29.7.2 User Authentication based on RADIUS .................................................................656
29.8 Interworking SIP Signaling ................................................................................... 656
29.8.1 Interworking SIP 3xx Redirect Responses ............................................................656
29.8.1.1 Resultant INVITE Traversing Device .................................................... 656
29.8.1.2 Local Handling of SIP 3xx ..................................................................... 658
29.8.2 Interworking SIP Diversion and History-Info Headers ...........................................658
29.8.3 Interworking SIP REFER Messages ......................................................................659
29.8.4 Interworking SIP PRACK Messages .....................................................................659
29.8.5 Interworking SIP Session Timer ............................................................................660
29.8.6 Interworking SIP Early Media ................................................................................660
29.8.7 Interworking SIP re-INVITE Messages ..................................................................662
29.8.8 Interworking SIP UPDATE Messages ...................................................................662
29.8.9 Interworking SIP re-INVITE to UPDATE ................................................................663
29.8.10 Interworking Delayed Offer ....................................................................................663
29.8.11 Interworking Call Hold ............................................................................................663
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