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Voice TEI is the TEI assigned to the voice channel. Choices are: Auto TEI, a fixed TEI
number, or Disable. AT command: *!D3=
Data MSN
The Data MSN (Multiple Subscriber Number) allows a caller to specify an individual
MTA128ST-USB when more than one unit is connected to your network terminator. If you
don't assign a value to the MSN, the unit accepts all incoming calls. If you only assign a
base address to the MSN, the unit accepts any incoming call with the same base
address, regardless of whether a subaddress is included. If you assign a base address
and a subaddress to the MSN, the unit only accepts calls that match both the base
address and the subaddress. The following examples show the syntax for setting the
MSN with and without a subaddress. AT command: !N1=
MSN with subaddress:
MSN without subaddress:
Voice MSN
Selects calls on the voice channel in the same way the Data MSN selects calls on the
data channel. AT command: *!N1=
SPIDs and DNs
For use with North American switches, the Service Profile Identifier (SPID) must be
configured in the MTA128ST-USB. The SPID is assigned by the local phone company
and is for the specific BRI line where the unit is attached. The SPID field is empty prior to
configuration.
AT commands: AT!C6= and AT*!C6=
Directory Number (DN) is the phone number another user calls to contact this unit once it
is attached to the ISDN.
AT commands: AT!N1= and AT*!N1=
Note:
SPIDs and DNs are used only by the U.S. NI-1, AT&T 5ESS, and DMS-100 switch
types.
Call Control Configuration
Persistent DTR Dialing
A high DTR (Data Terminal Ready) signal on the USB port indicates your computer or
terminal is ready to communicate with your MTA128ST-USB. DTR normally goes high
when a communication program starts or is ready to dial. Persistent DTR dialing enables
the unit to automatically redial the number stored in memory location 0 whenever DTR is
high and the serial port does not have an active call. You can enable or disable this
feature. AT command: $D
Auto Answer Data Calls
Rings to Answer
Select Auto Answer if you want your MTA128ST-USB to automatically answer all
incoming data calls (this option does not affect the analog port). The Rings to Answer
number, in the range of 1 to 255, selects the number of rings the unit waits before
answering an incoming call. The default is one ring. AT command: S0=
Dialing Method
Multi-Tech Systems, Inc. MTA128ST-USB External ISDN Terminal Adapter PN S000340
AT!N1=5551000:001 (base address is 5551000;
subaddress is 001)
AT!N1=5551000 (base address is 5551000)
Chapter 3 - Configuration
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