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The purpose of this is that a connected system shall not be
disturbed by any caller until the modem has made a proper
connection. The data equipment connected, is not supposed to
know the background activity. The modem will answer incoming
calls ONLY if the MAN/AUTO switch is activated. This call is
"silent", i.e. RI/125, CD/109, DSR/107, and the resultcodes
RING- and CONNECT will not be given
It is not possible to terminate an answer handshake by sending
data to the modem.
As soon as a connection is made (successful handshake), the
modem will transmit the following message to the caller:
ENTER DIALBACK CODE FOR REMOTE MODEM
or
CARRIAGE RETURN FOR DIRECT CONNECTION
The modem will now wait a number of seconds, determined by
value set in register +S3 , to receive a password (dialback code).
If one of the 3 following conditions is met, STEP 3 will start.
e A password is not received within the period set by register
+$3.
e The received password does not exist in the password table.
e The received password does not have a corresponding
dialback number in the password table.
If none of these conditions is met, i.e. the received password
does have a corresponding number defined, STEP 2 will start
and continue into STEP 3, described under Password/Dialback
Mode 1.
When dialback function is active, it is not possible to terminate
an answer handshake or dialback by sending data to the
modem. Other AT-commands and Escape sequence are
ignored awaiting dialback code.
Zat 14.4/14.4-7 and 19.2/19.2-7
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