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