ZyXEL Communications ACCESSING INTERNET & INTRANET omni series - Manual (Page 41)

ISDN Communication Basics 29
Manually switching communication modes (non-data)
The manual switching functions will only be necessary if your
communication software does not allow you to change your dial-up
string.
Conventional dialing commands: ATD, ATDT and ATDP, used by
many existing communication software, can be mapped onto one of
the new dialing commands according to the AT&O setting as
follows:
AT Command Dial string it will map to
AT&O0 ATD, ATDT and ATDP are the same as ATDB.
AT&O2 ATD, ATDT and ATDP are the same as ATDI.
AT&O3 ATD, ATDT and ATDP are the same as ATDA.
The factory default is AT&O2. This means the TA will select ISDN
data mode when you do not specify which communication mode to
use (i.e. ATD or ATDT).
Placing the Call
To initiate a call, choose the proper communication mode and
configure the mode according to the bearer service (or protocol) you
want to use. Here are some simple commands that will be useful
when placing a call:
Command Description
ATBnn Changes ISDN B channel protocol setting.
ATDL Re-dials the last dialed telephone number.
Incoming Calls
When a call comes in, it will be carried by one of the following
protocols:
•
V.120
•
HDLC PPP, MPPP or SLIP