AudioCodes Mediant 800B Manuel utilisateur

User’s Manual

AudioCodes Mediant™ Family of Media Gateways & Session Border Controllers

Mediant 800B Gateway

& Enterprise SBC (E-SBC)

Version 7.2

Version 7.2 3 Mediant 800B Gateway & E-SBC

User's Manual Contents

Table of Contents

1Introduction .......................................................................................................31

1.1 Product Overview...................................................................................................31

1.2 Typographical Conventions....................................................................................32

1.3 Getting Familiar with Configuration Concepts and Terminology............................32

1.3.1 SBC Application.......................................................................................................32

1.3.2 Gateway Application................................................................................................36

Getting Started with Initial Connectivity................................................................39

2Introduction .......................................................................................................41

3Default OAMP IP Address.................................................................................43

4Configuring VoIP LAN Interface for OAMP .....................................................45

4.1 Web Interface.........................................................................................................45

4.2 CLI..........................................................................................................................47

Management Tools..................................................................................................49

5Introduction .......................................................................................................51

6Web-Based Management..................................................................................53

6.1 Getting Acquainted with the Web Interface............................................................53

6.1.1 Computer Requirements..........................................................................................53

6.1.2 Accessing the Web Interface...................................................................................54

6.1.3 Areas of the GUI......................................................................................................55

6.1.4 Accessing Configuration Pages from Navigation Tree............................................57

6.1.5 Configuring Stand-alone Parameters......................................................................59

6.1.6 Configuring Table Parameters.................................................................................61

6.1.6.1 Adding Table Rows..................................................................................62

6.1.6.2 Assigning Rows from Other Tables..........................................................62

6.1.6.3 Modifying Table Rows..............................................................................64

6.1.6.4 Deleting Table Rows................................................................................64

6.1.6.5 Invalid Value Indications ..........................................................................65

6.1.6.6 Viewing Table Rows.................................................................................67

6.1.6.7 Sorting Tables by Column........................................................................68

6.1.6.8 Changing Index Position of Table Rows..................................................68

6.1.6.9 Searching Table Entries...........................................................................69

6.1.7 Searching for Configuration Parameters.................................................................69

6.1.8 Getting Help.............................................................................................................71

6.1.9 Logging Off the Web Interface.................................................................................71

6.2 Customizing the Web Interface..............................................................................71

6.2.1 Replacing the Corporate Logo.................................................................................72

6.2.1.1 Replacing the Corporate Logo with an Image..........................................72

6.2.1.2 Replacing the Corporate Logo with Text..................................................73

6.2.2 Customizing the Product Name...............................................................................74

6.2.3 Customizing the Favicon .........................................................................................74

6.2.4 Creating a Login Welcome Message.......................................................................76

6.3 Configuring Additional Management Interfaces.....................................................76

6.4 Configuring Management User Accounts ..............................................................79

User's Manual 4 Document #: LTRT-10632

Mediant 800B Gateway & E-SBC

6.5 Displaying Login Information upon Login...............................................................83

6.6 Viewing Logged-In User Information......................................................................84

6.7 Configuring Web Session and Access Settings.....................................................84

6.8 Changing Login Password for Administrator and Monitor Users ...........................86

6.9 Configuring Secured (HTTPS) Web.......................................................................86

6.10 Web Login Authentication using Smart Cards .......................................................87

6.11 Configuring Web and Telnet Access List...............................................................87

7CLI-Based Management....................................................................................89

7.1 Enabling CLI...........................................................................................................89

7.1.1 Enabling Telnet for CLI............................................................................................89

7.1.2 Enabling SSH with RSA Public Key for CLI.............................................................90

7.2 Configuring Maximum Telnet/SSH Sessions.........................................................92

7.3 Establishing a CLI Session ....................................................................................92

7.4 Viewing Current CLI Sessions ...............................................................................93

7.5 Terminating a User's CLI Session..........................................................................94

7.6 Configuring Displayed Output Lines in CLI Terminal Window ...............................94

8SNMP-Based Management...............................................................................97

8.1 Disabling SNMP.....................................................................................................97

8.2 Configuring SNMP Community Strings..................................................................97

8.3 Configuring SNMP Trap Destinations with IP Addresses ......................................99

8.4 Configuring an SNMP Trap Destination with FQDN ............................................101

8.5 Configuring SNMP Trusted Managers.................................................................101

8.6 Enabling SNMP Traps for Web Activity................................................................102

8.7 Configuring SNMP V3 Users................................................................................102

9INI File-Based Management............................................................................105

9.1 INI File Format .....................................................................................................105

9.1.1 Configuring Individual ini File Parameters.............................................................105

9.1.2Configuring Table ini File Parameters...................................................................105

9.1.3 General ini File Formatting Rules..........................................................................107

9.2 Configuring an ini File ..........................................................................................107

9.3 Loading an ini File to the Device..........................................................................108

9.4 Secured Encoded ini File.....................................................................................108

9.5 Configuring Password Display in ini File..............................................................108

9.6 INI Viewer and Editor Utility .................................................................................110

General System Settings ......................................................................................111

10 Configuring SSL/TLS Certificates..................................................................113

10.1 Configuring TLS Certificate Contexts...................................................................113

10.2 Assigning CSR-based Certificates to TLS Contexts............................................117

10.3 Viewing Certificate Information ............................................................................120

10.4 Assigning Externally Created Private Keys to TLS Contexts...............................121

10.5 Generating Private Keys for TLS Contexts..........................................................122

10.6 Creating Self-Signed Certificates for TLS Contexts.............................................123

10.7 Importing Certificates into Trusted Certificate Store ............................................124

Version 7.2 5 Mediant 800B Gateway & E-SBC

User's Manual Contents

10.8 Configuring Mutual TLS Authentication................................................................126

10.8.1 TLS for SIP Clients................................................................................................126

10.8.2 TLS for Remote Device Management...................................................................126

10.9 Configuring TLS Server Certificate Expiry Check................................................127

11 Date and Time..................................................................................................129

11.1 Configuring Automatic Date and Time using SNTP.............................................129

11.2 Configuring Date and Time Manually...................................................................130

11.3 Configuring the Time Zone...................................................................................130

11.4 Configuring Daylight Saving Time........................................................................131

General VoIP Configuration..................................................................................133

12 Network............................................................................................................135

12.1 Building and Viewing your Network Topology......................................................135

12.2 Configuring Physical Ethernet Ports ....................................................................138

12.3 Configuring Ethernet Port Groups........................................................................140

12.4 Configuring Underlying Ethernet Devices............................................................142

12.5 Configuring IP Network Interfaces .......................................................................146

12.5.1 Assigning NTP Services to Application Types ......................................................150

12.5.2 IP Interfaces Table Configuration Guidelines........................................................150

12.5.3 Networking Configuration Examples .....................................................................151

12.5.3.1 One VoIP Interface for All Applications................................................. 151

12.5.3.2 VoIP Interface per Application Type...................................................... 151

12.5.3.3 VoIP Interfaces for Combined Application Types ................................. 152

12.5.3.4 VoIP Interfaces with Multiple Default Gateways ................................... 153

12.6 Configuring Static IP Routes................................................................................153

12.6.1 Configuration Example of Static IP Routes ...........................................................155

12.6.2 Troubleshooting the Static Routes Table ..............................................................156

12.7 Network Address Translation Support .................................................................157

12.7.1 Device Located behind NAT..................................................................................157

12.7.1.1 Configuring a Static NAT IP Address for All Interfaces......................... 158

12.7.1.2 Configuring NAT Translation per IP Interface....................................... 159

12.7.2 Remote UA behind NAT........................................................................................160

12.7.2.1 SIP Signaling Messages....................................................................... 160

12.7.2.2 Media (RTP/RTCP/T.38)....................................................................... 161

12.8 Robust Receipt of Media Streams by Media Latching.........................................165

12.9 Configuring Quality of Service..............................................................................166

12.9.1 Configuring Class-of-Service QoS.........................................................................166

12.9.2 Configuring DiffServ-to-VLAN Priority Mapping.....................................................168

12.10Configuring ICMP Messages ...............................................................................169

12.11DNS......................................................................................................................170

12.11.1Configuring the Internal DNS Table.......................................................................170

12.11.2Configuring the Internal SRV Table.......................................................................171

12.12Open Solution Network (OSN) Server .................................................................173

12.12.1Configuring Native VLAN for OSN Server.............................................................173

12.12.2Disabling Internal Switch Port for OSN..................................................................174

12.13Multiple Routers Support......................................................................................174

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Mediant 800B Gateway & E-SBC

13 Security............................................................................................................175

13.1 Configuring Firewall Settings ...............................................................................175

13.2 Configuring General Security Settings.................................................................180

13.3 Intrusion Detection System..................................................................................181

13.3.1 Enabling IDS..........................................................................................................181

13.3.2 Configuring IDS Policies........................................................................................182

13.3.3 Assigning IDS Policies...........................................................................................186

13.3.4 Viewing IDS Alarms...............................................................................................188

14 Media................................................................................................................191

14.1 Configuring Voice Settings...................................................................................191

14.1.1 Configuring Voice Gain (Volume) Control .............................................................191

14.1.2 Configuring Echo Cancellation..............................................................................191

14.2 Fax and Modem Capabilities................................................................................193

14.2.1 Fax/Modem Operating Modes...............................................................................193

14.2.2 Fax/Modem Transport Modes ...............................................................................194

14.2.2.1 T.38 Fax Relay Mode............................................................................ 194

14.2.2.2 G.711 Fax / Modem Transport Mode.................................................... 196

14.2.2.3 Fax Fallback.......................................................................................... 197

14.2.2.4 Fax/Modem Bypass Mode .................................................................... 198

14.2.2.5 Fax / Modem NSE Mode....................................................................... 199

14.2.2.6 Fax / Modem Transparent with Events Mode....................................... 200

14.2.2.7 Fax / Modem Transparent Mode........................................................... 200

14.2.2.8 RFC 2833 ANS Report upon Fax/Modem Detection............................ 201

14.2.3 V.34 Fax Support...................................................................................................201

14.2.3.1 Bypass Mechanism for V.34 Fax Transmission.................................... 202

14.2.3.2 Relay Mode for T.30 and V.34 Faxes................................................... 203

14.2.3.3 V.34 Fax Relay for SG3 Fax Machines................................................. 203

14.2.4 V.150.1 Modem Relay...........................................................................................205

14.2.5 Simultaneous Negotiation of Fax (T.38) and Modem (V.150.1) Relay..................206

14.2.6 V.152 Support........................................................................................................206

14.3 Configuring RTP/RTCP Settings..........................................................................206

14.3.1 Configuring the Dynamic Jitter Buffer....................................................................207

14.3.2 Comfort Noise Generation.....................................................................................208

14.3.3 Configuring DTMF Transport Types......................................................................208

14.3.4 Configuring RFC 2833 Payload.............................................................................210

14.3.5 Configuring RTP Base UDP Port...........................................................................210

14.4 Event Detection and Notification using X-Detect Header.....................................211

14.4.1 SIT Event Detection...............................................................................................213

14.4.2 Detecting Answering Machine Beeps....................................................................214

14.4.3 SIP Call Flow Examples of Event Detection and Notification................................215

14.5 Answering Machine Detection (AMD)..................................................................217

14.5.1 Configuring AMD ...................................................................................................219

14.5.2 Enabling IP-to-Tel Call Disconnection upon Detection of Answering Machine.....220

14.6 Automatic Gain Control (AGC).............................................................................221

14.7 Configuring Media (SRTP) Security.....................................................................222

14.7.1 SRTP using DTLS Protocol...................................................................................224

15 Services ...........................................................................................................227

15.1 DHCP Server Functionality..................................................................................227

15.1.1 Configuring the DHCP Server ...............................................................................227

15.1.2 Configuring the Vendor Class Identifier.................................................................232

15.1.3 Configuring Additional DHCP Options...................................................................233

Version 7.2 7 Mediant 800B Gateway & E-SBC

User's Manual Contents

15.1.4 Configuring Static IP Addresses for DHCP Clients ...............................................235

15.1.5 Viewing and Deleting DHCP Clients......................................................................236

15.2 SIP-based Media Recording................................................................................237

15.2.1 Enabling SIP-based Media Recording...................................................................241

15.2.2 Configuring SIP Recording Rules..........................................................................242

15.2.3 Configuring SIP User Part for SRS........................................................................244

15.2.4 Interworking SIP-based Media Recording with Third-Party Vendors....................244

15.2.4.1 Genesys................................................................................................ 245

15.2.4.2 Avaya UCID........................................................................................... 245

15.3 RADIUS-based Services......................................................................................246

15.3.1 Enabling RADIUS Services ...................................................................................246

15.3.2 Configuring RADIUS Servers................................................................................246

15.3.3 Configuring Interface for RADIUS Communication...............................................249

15.3.4 Configuring RADIUS Packet Retransmission........................................................249

15.3.5 Configuring the RADIUS Vendor ID ......................................................................249

15.3.6 RADIUS-based Management User Authentication ...............................................250

15.3.6.1 Setting Up a Third-Party RADIUS Server ............................................. 251

15.3.6.2 Configuring RADIUS-based User Authentication.................................. 252

15.3.6.3 Securing RADIUS Communication ....................................................... 253

15.3.6.4 RADIUS-based User Authentication in URL......................................... 253

15.3.7 RADIUS-based CDR Accounting ..........................................................................254

15.4 LDAP-based Management and SIP Services......................................................254

15.4.1 Enabling the LDAP Service...................................................................................255

15.4.2 Enabling LDAP-based Web/CLI User Login Authentication and Authorization.....256

15.4.3 Configuring LDAP Server Groups .........................................................................256

15.4.4 Configuring LDAP Servers.....................................................................................258

15.4.5 Configuring LDAP DNs (Base Paths) per LDAP Server........................................262

15.4.6 Configuring the LDAP Search Filter Attribute........................................................263

15.4.7 Configuring Access Level per Management Groups Attributes ............................264

15.4.8 Configuring the Device's LDAP Cache..................................................................266

15.4.8.1 Refreshing the LDAP Cache................................................................. 268

15.4.8.2 Clearing the LDAP Cache..................................................................... 270

15.4.9 Configuring Local Database for Management User Authentication......................271

15.4.10LDAP-based Login Authentication Example..........................................................271

15.4.11Enabling LDAP Searches for Numbers with Characters.......................................275

15.4.12AD-based Routing for Microsoft Skype for Business ............................................276

15.4.12.1Querying the AD and Routing Priority................................................... 276

15.4.12.2Configuring AD-Based Routing Rules................................................... 280

15.4.12.3Querying the AD for Calling Name........................................................ 282

15.5 Least Cost Routing...............................................................................................283

15.5.1 Overview................................................................................................................283

15.5.2 Configuring LCR....................................................................................................285

15.5.2.1 Configuring Cost Groups....................................................................... 285

15.5.2.2 Assigning Cost Groups to Routing Rules.............................................. 288

15.6 Remote Web Services .........................................................................................288

15.6.1 Configuring Remote Web Services .......................................................................288

15.6.1.1 Configuring Remote HTTP Hosts.......................................................... 292

15.6.2 Enabling Topology Status Services.......................................................................294

15.6.3 Centralized Third-Party Routing Server.................................................................294

15.6.4 Configuring QoS-Based Routing by Routing Server.............................................297

15.7 HTTP-based Proxy Services................................................................................299

15.7.1 Enabling the HTTP Proxy Application ...................................................................300

15.7.2 Debugging Remote HTTP Services ......................................................................300

15.7.3 Configuring HTTP Interfaces.................................................................................300

15.7.4 Configuring HTTP Proxy Services.........................................................................302

User's Manual 8 Document #: LTRT-10632

Mediant 800B Gateway & E-SBC

15.7.4.1 Configuring HTTP Proxy Hosts............................................................. 303

15.7.5 Configuring an HTTP-based EMS Service............................................................305

15.8 E9-1-1 Support for Microsoft Skype for Business................................................307

15.8.1 About E9-1-1 Services...........................................................................................307

15.8.2 Microsoft Skype for Business and E9-1-1 .............................................................308

15.8.2.1 Gathering Location Information of Skype for Business Clients for 911

Calls 308

15.8.2.2 Adding ELINs to the Location Information Server................................. 310

15.8.2.3 Passing Location Information to the PSTN Emergency Provider......... 311

15.8.3 AudioCodes ELIN Device for Skype for Business E9-1-1 Calls to PSTN.............312

15.8.3.1 Detecting and Handling E9-1-1 Calls.................................................... 312

15.8.3.2 Pre-empting Existing Calls for E9-1-1 Calls.......................................... 314

15.8.3.3 PSAP Callback to Skype for Business Clients for Dropped E9-1-1 Calls

315

15.8.3.4 Selecting ELIN for Multiple Calls within Same ERL.............................. 315

15.8.3.5 Location Based Emergency Routing..................................................... 316

15.8.4 Configuring AudioCodes ELIN Device...................................................................316

15.8.4.1 Enabling the E9-1-1 Feature................................................................. 316

15.8.4.2 Configuring the E9-1-1 Callback Timeout............................................. 317

15.8.4.3 Configuring the SIP Release Cause Code for Failed E9-1-1 Calls....... 317

15.8.4.4 Configuring SBC IP-to-IP Routing Rule for E9-1-1............................... 317

15.8.4.5 Configuring Location-Based Emergency Routing................................. 318

15.8.4.6 Viewing the ELIN Table......................................................................... 320

15.9 Microsoft Skype for Business Presence of Third-Party Endpoints.......................320

15.9.1 Configuring Skype for Business Server for Presence...........................................322

15.9.2 Configuring the Device for Skype for Business Presence.....................................323

16 Quality of Experience......................................................................................325

16.1 Reporting Voice Quality of Experience to SEM....................................................325

16.1.1 Configuring the SEM Server..................................................................................325

16.1.2 Configuring Clock Synchronization between Device and SEM.............................326

16.1.3 Enabling RTCP XR Reporting to SEM ..................................................................326

16.2 Configuring Quality of Experience Profiles...........................................................327

16.3 Configuring Bandwidth Profiles............................................................................332

16.4 Configuring Quality of Service Rules ...................................................................335

17 Control Network ..............................................................................................339

17.1 Configuring Media Realms...................................................................................339

17.1.1 Configuring Remote Media Subnets......................................................................342

17.1.2 Configuring Media Realm Extensions ...................................................................345

17.2 Configuring SRDs ................................................................................................347

17.2.1 Filtering Tables in Web Interface by SRD .............................................................353

17.2.2 Multiple SRDs for Multi-tenant Deployments.........................................................353

17.2.3 Cloning SRDs........................................................................................................355

17.2.4 Color-Coding of SRDs in Web Interface................................................................356

17.2.5 Automatic Configuration based on SRD................................................................357

17.3 Configuring SIP Interfaces...................................................................................357

17.4 Configuring IP Groups..........................................................................................365

17.5 Configuring Proxy Sets ........................................................................................380

17.6 Building and Viewing SIP Entities in Topology View............................................389

18 SIP Definitions.................................................................................................395

18.1 Configuring Registration Accounts.......................................................................395

18.1.1 Regular Registration Mode....................................................................................400

Version 7.2 9 Mediant 800B Gateway & E-SBC

User's Manual Contents

18.1.2 Single Registration for Multiple Phone Numbers using GIN..................................400

18.1.3 Registrar Stickiness...............................................................................................402

18.2 Configuring Proxy and Registration Parameters..................................................402

18.2.1 SIP Message Authentication Example ..................................................................403

18.3 Configuring Call Setup Rules...............................................................................404

18.3.1 Call Setup Rule Examples.....................................................................................410

19 SIP Message Manipulation .............................................................................413

19.1 Configuring SIP Message Manipulation...............................................................413

19.2 Configuring Message Condition Rules.................................................................419

19.3 Configuring SIP Message Policy Rules................................................................420

19.4 Configuring Pre-Parsing Manipulation Rules.......................................................424

20 Coders and Profiles ........................................................................................427

20.1 Configuring Coder Groups...................................................................................427

20.1.1 Supported Audio Coders .......................................................................................429

20.1.2 Configuring Various Codec Attributes ...................................................................431

20.2 Configuring Allowed Audio Coder Groups ...........................................................432

20.3 Configuring Allowed Video Coder Groups ...........................................................435

20.4 Configuring IP Profiles .........................................................................................436

20.5 Configuring Tel Profile..........................................................................................473

Gateway Application .............................................................................................487

21 Introduction .....................................................................................................489

21.1 Call Processing Summary....................................................................................489

22 Digital PSTN.....................................................................................................493

22.1 Configuring Trunk Settings...................................................................................493

22.2 TDM and Timing...................................................................................................495

22.2.1 TDM Bus Clock Settings........................................................................................495

22.2.1.1 Recovering Clock from PSTN Line Interface........................................ 495

22.2.1.2 Configuring Internal Clock as Clock Source ......................................... 496

22.3 Configuring CAS State Machines.........................................................................497

22.4 Configuring Digital Gateway Parameters.............................................................499

22.5 Tunneling Applications.........................................................................................500

22.5.1 TDM Tunneling......................................................................................................500

22.5.1.1 DSP Pattern Detector............................................................................ 503

22.5.2 Configuring Private Wire Interworking...................................................................503

22.5.3 QSIG Tunneling.....................................................................................................508

22.6 ISDN Non-Facility Associated Signaling (NFAS).................................................509

22.6.1 NFAS Interface ID..................................................................................................510

22.6.2 Working with DMS-100 Switches ..........................................................................511

22.6.3 Creating an NFAS-Related Trunk Configuration...................................................511

22.6.4 Performing Manual D-Channel Switchover in NFAS Group..................................512

22.7 ISDN Overlap Dialing...........................................................................................512

22.7.1 Collecting ISDN Digits and Sending Complete Number in SIP.............................512

22.7.2 Interworking ISDN Overlap Dialing with SIP According to RFC 3578...................513

22.8 Redirect Number and Calling Name (Display).....................................................514

User's Manual 10 Document #: LTRT-10632

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23 Trunk Groups ..................................................................................................517

23.1 Configuring Trunk Groups....................................................................................517

23.2 Configuring Trunk Group Settings Table..............................................................519

24 Routing.............................................................................................................525

24.1 Configuring Tel-to-IP Routing Rules ....................................................................525

24.2 Configuring IP-to-Tel Routing Rules ....................................................................534

24.3 Configuring a Gateway Routing Policy Rule........................................................539

24.4 Alternative Routing for Tel-to-IP Calls..................................................................541

24.4.1 IP Destinations Connectivity Feature ....................................................................541

24.4.2 Alternative Routing Based on IP Connectivity.......................................................542

24.4.3 Alternative Routing Based on SIP Responses......................................................544

24.4.4 Alternative Routing upon SIP 3xx with Multiple Contacts......................................547

24.4.5 PSTN Fallback.......................................................................................................548

24.5 Alternative Routing for IP-to-Tel Calls..................................................................549

24.5.1 Alternative Routing to Trunk upon Q.931 Call Release Cause Code ...................549

24.5.2 Alternative Routing to an IP Destination upon a Busy Trunk ................................551

24.5.3 Alternative Routing upon ISDN Disconnect...........................................................552

24.5.4 Alternative Routing from FXO to IP.......................................................................553

25 Manipulation....................................................................................................555

25.1 Configuring Redirect Reasons.............................................................................555

25.2 Configuring Source/Destination Number Manipulation Rules..............................555

25.3 Manipulating Number Prefix.................................................................................561

25.4 SIP Calling Name Manipulations..........................................................................562

25.5 Configuring Redirect Number IP to Tel................................................................566

25.6 Manipulating Redirected and Diverted Numbers for Call Diversion.....................570

25.7 Mapping NPI/TON to SIP Phone-Context............................................................571

25.8 Configuring Release Cause Mapping ..................................................................573

25.8.1 SIP-to-ISDN Release Cause Mapping ..................................................................573

25.8.1.1 Configuring SIP-to-ISDN Release Cause Mapping .............................. 573

25.8.1.2 Fixed Mapping of SIP Response to ISDN Release Reason................. 574

25.8.2 ISDN-to-SIP Release Cause Mapping ..................................................................576

25.8.2.1 Configuring ISDN-to-SIP Release Cause Mapping .............................. 576

25.8.2.2 Fixed Mapping of ISDN Release Reason to SIP Response................. 577

25.8.3 Configuring ISDN-to-ISDN Release Cause Mapping............................................579

25.8.4 Reason Header......................................................................................................581

25.9 Numbering Plans and Type of Number................................................................581

26 Configuring DTMF and Dialing.......................................................................583

26.1 Dialing Plan Features...........................................................................................583

26.1.1 Digit Mapping.........................................................................................................583

26.1.2 External Dial Plan File ...........................................................................................584

26.2 Interworking Keypad DTMFs for SIP-to-ISDN Calls.............................................584

26.3 Configuring Hook Flash........................................................................................585

27 Configuring Supplementary Services ...........................................................587

27.1 Call Hold and Retrieve.........................................................................................587

27.2 Call Pickup...........................................................................................................589

27.3 BRI Suspend and Resume...................................................................................589

27.4 Consultation Feature............................................................................................590

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