SIP User's Manual 6 Document #: LTRT-12804
Mediant 800 MSBG
8.3.3.2
FXO Device Interworking SIP E911 Calls from Service Provider's IP
Network to PSAP DID Lines ................................................................................. 424
8.3.3.3 Pre-empting Existing Calls for E911 IP-to-Tel Calls ............................. 427
8.3.4 Configuring DTMF Transport Types ......................................................................428
8.3.5 FXS and FXO Capabilities .....................................................................................430
8.3.5.1 FXS/FXO Coefficient Types .................................................................. 430
8.3.5.2 FXO Operating Modes .......................................................................... 430
8.3.5.3 Remote PBX Extension Between FXO and FXS Devices .................... 437
8.3.6 Configuring Alternative Routing (Based on Connectivity and QoS) ......................442
8.3.6.1 Alternative Routing Mechanism ............................................................ 442
8.3.6.2 Determining the Availability of Destination IP Addresses ..................... 442
8.3.6.3 PSTN Fallback ...................................................................................... 442
8.3.7 Fax and Modem Capabilities .................................................................................443
8.3.7.1 Fax/Modem Operating Modes ............................................................... 443
8.3.7.2 Fax/Modem Transport Modes ............................................................... 443
8.3.7.3 V.34 Fax Support .................................................................................. 449
8.3.7.4 V.152 Support ....................................................................................... 452
8.3.8 Working with Supplementary Services ..................................................................453
8.3.8.1 Call Hold and Retrieve .......................................................................... 453
8.3.8.2 BRI Suspend and Resume .................................................................... 455
8.3.8.3 Consultation Feature ............................................................................. 455
8.3.8.4 Call Transfer .......................................................................................... 456
8.3.8.5 Call Forward .......................................................................................... 457
8.3.8.6 Call Waiting ........................................................................................... 460
8.3.8.7 Message Waiting Indication .................................................................. 461
8.3.8.8 Caller ID ................................................................................................ 463
8.3.8.9 Three-Way Conferencing ...................................................................... 465
8.3.8.10 Multilevel Precedence and Preemption ................................................. 467
8.3.9 SIP Call Routing Examples....................................................................................469
8.3.9.1 SIP Call Flow Example .......................................................................... 469
8.3.9.2 SIP Authentication Example .................................................................. 471
8.3.9.3 Establishing a Call between Two Devices ............................................ 474
8.3.9.4 SIP Trunking between Enterprise and ITSPs ....................................... 475
8.3.10 Mapping PSTN Release Cause to SIP Response ................................................478
8.3.11 Querying Device Channel Resources using SIP OPTIONS ..................................479
8.4 SBC Application ................................................................................................... 480
8.4.1 Overview ................................................................................................................480
8.4.1.1 NAT Traversal ....................................................................................... 481
8.4.1.2 VoIP Firewall ......................................................................................... 481
8.4.1.3 Topology Hiding .................................................................................... 481
8.4.1.4 SIP Normalization .................................................................................. 482
8.4.1.5 Survivability ........................................................................................... 482
8.4.2 SIP Network Definitions .........................................................................................482
8.4.3 SIP Dialog Initiation Process .................................................................................482
8.4.3.1 Determining Source and Destination URL ............................................ 483
8.4.3.2 Source IP Group Classification ............................................................. 484
8.4.3.3 SBC IP-to-IP Routing ............................................................................ 485
8.4.3.4 IP-to-IP Inbound and Outbound Manipulation ....................................... 486
8.4.3.5 SIP Header Manipulation ...................................................................... 488
8.4.4 User Registration and Internal Database ..............................................................490
8.4.4.1 Initial Registration Request Processing ................................................ 490
8.4.4.2 Internal Database .................................................................................. 491
8.4.4.3 Routing using Internal Database ........................................................... 492
8.4.4.4 Registration Refreshes .......................................................................... 492
8.4.4.5 Registration Restriction Control ............................................................ 492
8.4.5 SBC Media Handling .............................................................................................493
8.4.5.1 Media Anchoring without Transcoding (Transparent) ........................... 494
8.4.5.2 Media Anchoring with Transcoding ....................................................... 495
8.4.5.3 No Media Anchoring .............................................................................. 497
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