AudioCodes Mediant 3000 User Manual page 8

18.7.2 Determining the Availability of Destination IP Addresses ......................................327
18.7.3 PSTN Fallback .......................................................................................................327
18.8 SIP Call Routing Examples .................................................................................. 328
18.8.1 SIP Call Flow Example ..........................................................................................328
18.8.2 SIP Message Authentication Example ..................................................................330
18.8.3 Trunk-to-Trunk Routing Example ..........................................................................333
18.8.4 SIP Trunking between Enterprise and ITSPs ........................................................334
18.9 IP-to-IP Routing Application ................................................................................. 338
18.9.1 Theory of Operation ...............................................................................................339
18.9.1.1 Proxy Sets ............................................................................................. 340
18.9.1.2 IP Groups .............................................................................................. 340
18.9.1.3 Inbound and Outbound IP Routing Rules ............................................. 342
18.9.1.4 Accounts ................................................................................................ 342
18.9.2 IP-to-IP Routing Configuration Example ................................................................342
18.9.2.1 Step 1: Enable the IP-to-IP Capabilities ................................................ 345
18.9.2.2 Step 2: Configure the Number of Media Channels ............................... 345
18.9.2.3 Step 3: Define a Trunk Group for the Local PSTN ................................ 346
18.9.2.4 Step 4: Configure the Proxy Sets .......................................................... 346
18.9.2.5 Step 5: Configure the IP Groups ........................................................... 348
18.9.2.6 Step 6: Configure the Account Table .................................................... 351
18.9.2.7 Step 7: Configure IP Profiles for Voice Coders ..................................... 352
18.9.2.8 Step 8: Configure Inbound IP Routing .................................................. 354
18.9.2.9 Step 9: Configure Outbound IP Routing ................................................ 355
18.9.2.10 Step 10: Configure Destination Phone Number Manipulation .............. 357
19 Session Border Controller .............................................................................. 359
19.1 SBC Overview ...................................................................................................... 359
19.1.1 SIP Network Definitions .........................................................................................360
19.1.2 SIP Dialog Initiation Process .................................................................................360
19.1.2.1 Determining Source and Destination URL ............................................ 362
19.1.2.2 Source IP Group Classification ............................................................. 362
19.1.2.3 SBC IP-to-IP Routing ............................................................................ 363
19.1.2.4 IP-to-IP Inbound and Outbound Manipulation ....................................... 364
19.1.2.5 SIP Header Manipulation ...................................................................... 366
19.1.3 User Registration and Internal Database ..............................................................367
19.1.3.1 Initial Registration Request Processing ................................................ 367
19.1.3.2 Internal Database .................................................................................. 368
19.1.3.3 Routing using Internal Database ........................................................... 369
19.1.3.4 Registration Refreshes .......................................................................... 369
19.1.3.5 Registration Restriction Control ............................................................ 370
19.1.4 SBC Media Handling .............................................................................................370
19.1.4.1 Media Anchoring without Transcoding (Transparent) ........................... 372
19.1.4.2 Media Anchoring with Transcoding ....................................................... 372
19.1.4.3 No Media Anchoring .............................................................................. 374
19.1.4.4 Interworking DTMF Methods ................................................................. 375
19.1.4.5 Transcoding Modes ............................................................................... 376
19.1.4.6 Restricting Coders ................................................................................. 376
19.1.4.7 SRTP-RTP Transcoding ........................................................................ 378
19.1.4.8 Multiple RTP Media Streams per Call Session ..................................... 379
19.1.5 Fax Negotiation and Transcoding ..........................................................................379
19.1.6 SIP Dialog Admission Control ...............................................................................380
19.1.7 Limiting SBC Call Duration ....................................................................................380
19.1.8 SIP Authentication Server for SBC Users .............................................................380
19.1.9 Handling SIP 3xx Redirect Responses ..................................................................381
19.1.10 Interworking SIP Diversion and History-Info Headers ...........................................382
19.1.11 Call Survivability ....................................................................................................383
19.1.11.1 Auto-Provisioning of Subscriber-Specific Information for BroadWorks
Server for Survivability .......................................................................................... 383
SIP User's Manual 8
Mediant 3000
Document #: LTRT-89712