User guide

92
Chapter 5 - AT Commands
Network Configuration Commands
Use the following commands to select your network switch type (e.g., Northern Telecom DMS-100) and to
specify other information required to make an ISDN connection.
%A97=n Dialing Method
Values: n = 0 or 1
Default: %A97=0 (En bloc)
Standardized ISDN signalling protocols such as DSS1, DSS2, and SS7 support sending
complete indication, a signal that no more digits will follow. Adding such a signal to a
telephone number is often impractical; therefore, many private networks send the number of a
called party using a procedure called overlap sending, in which no sending complete
indication is sent. Computer users can automatically append the sending complete indication
to the telephone number by choosing the en bloc method of sending, which results in faster
call setup. Use the %A97= command to select between the two methods.
%A97=0 En bloc sending during call SETUP
%A97=1Overlap sending during call SETUP
>A0=n Type of Coding (Speech/3.1KHz Audio)
Unit: Decimal ASCII code
Values: n=0 (A-law),
n=1 (u-law)
Default: Switch-type dependent:
AT&T 5ESS -- n=1 (u-law)
DMS-100 -- n=1 (u-law)
EuroISDN NET3 -- n=0 (A-law)
INS64 -- n=1 (u-law)
US NI-1 -- n=1 (u-law)
VN4 -- n=0 (A-law)
With >A0=n it is possible to use a type of Speech/3.1KHz Audio coding that differs from the
default type of coding for a specific switch type. This capability is useful for countries that
require a specific switch type and a specific type of coding. For example, now it is possible to
use u-law coding with NET3, which is how it is used in Taiwan, whereas NET3 by default uses
A-law coding. AT!L<CR> or the @CONFIG configuration menu may be used to review the
type of coding.