Answering a Call using MSN | ZyXEL Communications omni series

length that the receiving side allows. Sometimes this information will be exchanged during handshaking. However, few manufacturers, if any, have implemented this mechanism.

If the sending side sends packets greater than what the receiving side allows, the receiving side will discard the frame and reply with a Frame Reject frame (FRMR). FRMR indicates that the information received is too long. Both sides will then reset their link layer negotiation and re-send the frame again. Usually this will happen repeatedly until the call gets disconnected.

The omni has a fixed maximum receiving frame size of 2048 octets which is larger than most devices can support. The default maximum sending frame size is 252 octets for V.120 and 2048 for X.75. If you need to change the maximum sending frame size, the ATCL command should be used.

Type:

ATCL252<Enter> (Set the frame size to 252 octets, user value between 1-2048)

TA responds:

OK

Type:

ATCL?<Enter> (To inquire about the current setting of the packet length)

TA responds:

Maximum user data length in a packet (byte) : 252

Answering a Call using MSN

When answering an incoming call, the call will first be identified if the caller number matches the MSN settings.

The Multiple Subscriber Number (MSN) supplementary service enables multiple ISDN numbers to be assigned to a single ISDN BRI line. It allows the caller to select, via the public network, one or more distinct terminals from a variety of terminal choices. Since the Omni

ISDN Communication Basics 31

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ZyXEL Communications omni series user manual Answering a Call using MSN

Contents

ZyXEL ZyXEL Limited Warranty Copyright 1997 by ZyXEL FCC Part 15 InformationAcknowledgments Page ∙ E-mail Contacting ZyXELPage Contents Incoming Calls Understanding AT CommandsInstalling the Windows 95 Driver INF file Outgoing Calls Placing outgoing calls Configuring Windows 95 Dial-Up Networking Capi InstallationIntroduction Feature list Error Correction and Data Compression with Call Control for 1TR6 Old German Isdn Answering an X.75 call Making an X.75 CallInvoking V.42bis Data Compression Call Control for DSS1 Upgrading with Flash Eprom Diagnostics 100Resetting The omni 103 Using The Embedded Protocol Analyzer Placing a Call Viewing and Setting S-Registers 125 AT Command Descriptions 109Register Descriptions 127 Introduction Key to Model Differentiation Key Features of the omniSpeed and Compatibility Technical Specifications Intelligent Features Unpacking Your omni Physical CharacteristicsInterface Option How to Become a Registered Owner Introduction LED Indicators Installing omni External ModelsFront Panel Page Back Panel Front Panel Switch Connecting to Your Computer Connecting to the Power Supply Connecting the omni.net to Your Computer Interface Model Connecting to Your Isdn Line Interface Power On and Self Diagnostics Installing omni External Models Selecting the Baud Rate Multiplier Installing omni Internal Models Plug and Play Connecting the TA to your PC Press Y to continue Following message will appear Connecting to Your Isdn Line Interface Model Omni.net Internal Card Installation S/T interface Type A\setup.exe and press Enter Configuring Your Isdn Line and NetworkConfiguring Your TA Configuring your TA using a Terminal program TA should respond Type Page Configuring Your Isdn Line and Network Isdn Communication Basics Understanding AT Commands Quick Tips when issuing AT commands Supported AT command typesType of AT Command Example ATV0 Dialing out using Isdn modeCommand Description Outgoing Calls Dialing out for Analog Adapter Port 1 omni.net Dialing out for Analog Adapter Port 1 omni.net InternalDialing out for Analog Adapter Port 2 omni.net Placing the Call Manually switching communication modes non-dataAT Command Dial string it will map to Incoming Calls Determining the Packet Length Digital Data Answering a Call using MSN AT&ZIn=s where ‘s’ is the MSN Best-effort call answering non-data Ambiguity resolution switch for voice calls omni.netCommand Function Data over Speech Channel Multi auto-answering of data calls Installing the Windows 95 Driver INF file Setup for Windows 95 and NTPage Page Configuring Windows 95 Dial-Up Networking Page Page IPX/SPX Compatible Click on TCP/IP Settings Capi Installation Page Introduction Point-to-Point Protocol PPP Async to Sync Conversion external Feature list Compression Control Protocol CCP Multilink PPP Bandwidth On Demand BOD BACP/BAP Point-to-Point Protocol PPP Answering a V.110 call 110 and Synchronous Mode Communications Making V.110 Calls AT Command DescriptionSynchronous Connections external DIC 25bis Command SetCommand Messages CIC DTR Drop-Dialing Operation Indicator Messages AT*D0 56 V.110 and Synchronous Mode Communications Placing outgoing calls 120 Isdn Communications Configuring the V.120 mode Answering incoming calls Dialing in V.120 mode Identifying your line provisioning Speeds of 128KbpsMaking a Bundled Call with Dialing pre-stored phone numbers Error Correction and Data Compression with Selecting V.120 for Germany National Isdn 1TR6 Selecting V.120 for European Isdn DSS1Bundle Connection with V.42bis Data Compression Page 10 X.75 Isdn Communications Making an X.75 Call Answering an X.75 call ATDIphonenumber1+phonenumber2 Invoking V.42bis Data Compression Bundle Connection with V.42bis Data Compression 70 X.75 Isdn Communications AT&V6 Handling Analog Calls non-dataAT&V7 Placing a Call from the Analog Adapter European switch specific Scenarios of an Incoming Voice Call Outcome Accepting an Incoming Call AT Commands Description InterCom Feature Phone omni.netCommands Description Flash key Placing a second call Call WaitingReceiving a second call Three-way Conference Call Call BrokerCall Reject Call Transfer HFlash è H#3 Advanced Isdn Call Control Control of Outgoing Service IndicatorCall Control for DSS1 S80 bit ‘n’ as follows S108+n= FunctionS108.n= Function = YnNnown-number/Znown-Subaddress Control of Isdn Phone Number and Sub-address Call Control for 1TR6 Old German Isdn Modem Control of Endgerä Teauswahlziffer EAZG3 Fax Command Function Answering a Call for DSS1 Answering a Call Best-effort Call Answering Answering a Call for 1TR6 Multi-Auto-Answering of Data Calls Ambiguity Resolution Switch for Voice Calls non-dataData Call Indication Disable inbound call connection ATDxYnNncalledpartynumber/Zncalled-party- subaddress Point-to-Point ConfigurationPlacing a Call Placing a call for DSS1 Placing a call for 1TR6 Leased Line Isdn ATAB1 ATDB1ATDB2 ATDB3 Security Types and Levels Security Functions Level Level 1 securityLevel 2 security Level 3 security Setting and Modifying Passwords Non-password Auto Call Back Function Security Functions Upgrading with Flash Eprom Upgrading Your omni Kernel Mode Test Description DiagnosticsDiagnostics Test Isdn Loopback test AT&T9 Power-on Self-testLoopback with Self-test AT&T10 B1/B2 Loopback with Self-test AT&T11 Diagnostic Command Atcg Using The Embedded Protocol Analyzer Resetting The omni Capturing the Protocol Data CB1 CD0CD1 CB0 Key Function Description ATC$ Diagnostics Operation Modes of the DTE Interface AT Command Set ReferenceSimplex mode Multiplex mode Basic AT Command Set AT Command Descriptions All the Following Commands Require a AT Prefix Command Options Function & Description BP1 BP0CE0 CP0 CE1CH? CL? Command Options Function & Description DN? DB1DB2 DB3 USA ATI SPID? IsdnSPID0 SPID1 UPX Description of ATI3 OutputOutput Parameter Output Value Description Extended AT& Command Set Isdn Command Options Function & Description Command Options Function & Description Extended AT* Command Set Command Options Function & Description AT Command Set Reference Status Registers and Result Codes Viewing and Setting S-RegistersViewing S-registers Setting S-registers Not Register DescriptionsBit Binary value Decimal value Hexadecimal value Operation Example-1 Example-2 Binary Dec Hex Extended S-Registers ATSn=x Command Function & DescriptionCommand Bit Dec Hex Function and description Basic S-Registers ATSn=x Command Bit Dec Hex Function and description ATX1 ATX0ATX2 ATX3 ATX4 Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Complete Command Bit Dec Hex Function and description Enable loopback 4 test DCA function enabled Command Bit Dec Hex Function and description SI= Fernsprechen analog 48000 bps PPP/MLPPP Command Bit Dec Hex Function and description PPP ATV0 ATV1 ATXn Result Code Option Table Connect Result Code Field Descriptions Result Code Chart Symbol ReferenceField Name Possible Values Connect Strings for Error Corrected Connections Status Registers and Result Codes Phone Jack Pinout Assignments Not Connected Phone Jack Pinout Assignments DCE Signal/Pin Number Description Direction NameSerial Port Interface Pin CD DCD DTR DTEMAC TXD RXD RTS CTS DSR Index Index Bundled Index