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All the above commands can be simplified by combining all of the
commands onto one line as follows:
AT&B20&E1&WZ0<Enter>
Dialing in V.120 mode
Finally, use the ATDn command to make the call (n is the phone
number you wish to dial). Once the connection is made, you should
see the following connect message.
CONNECT 115200/V120 56000/LAPD
This indicates that the connection is made with:
DTE speed of 115,200bps.
V.120 Protocol
Data Speed of 56,000bps.
Error Control LAPD.
Answering incoming calls
In most cases, there is no need to configure the TA to properly
answer calls. The TA is able to decide which protocol to use by
detecting the type of data that is coming in. All you need to do is set
S0 to greater than or equal to 1, so the TA will automatically answer
an incoming call. If S0=0, the DCE will simply report "RING" to
your terminal. External models will also make an audible ring
notification.
One exception to this is when the ISDN data call is carried through
Speech bearer. In this case, you would need to make an MSN entry
for the phone number that you are expecting the Data-over-Speech-
bearer call. Use AT&ZI2=n. Refer to the section entitled "Data over
Speech Channel" in Chapter 5 for details.
V.120 ISDN Communications 59
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