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Application Notes
GENERAL
After each attempted call (answer or originate, successful or incomplete), the modem is automatically reset to
factory default parameters.
Default modem operation and behavior:
Call type is analog Data Modem.
Auto answer is disabled (not supported).
V.92 enabled (auto negotiate fastest carrier rate possible with pier starting at V.92 and working it's way
down to Bell 103).
V.44 enabled (Auto negotiate reliable connection with pier starting with V.44, then V.42, then Normal
mode if reliable connection is not established within allotted variables).
Command mode Echo is disabled (E0 is set).
Extended result codes are enabled in Answer mode.
Result codes are disabled in Originate mode.
Escape Sequence is disabled in Answer mode.
Escape Sequence is enabled in Originate mode.
If, for inbound calls, the desired call type is to be something other than default, the call type command (index
112) must be issued with the "answer" command.
For Example:
Open the socket to the modem.
Initialize the modem (ate0q0).
Look for response "ok" (if applicable).
Look for the "ring" call progress message.
Issue the appropriate answer string.
For example, if the incoming call is an ISDN HDLC call, issue: at:m112=64a
Look for the call progress (connect 64000) message.
Look for, or start sending, application data
If, for outbound calls, the desired call type is to be something other than default, the call type command (index
112) must be precede the dial string (either as a separate command or chained with the dial string).
For Example, dialing out to a remote ISDN location:
Open the socket to the modem.
Initialize the modem (ate0q0).
Look for response "ok" (if applicable).
Issue the Call Type command followed by the dial string
at:m112=64
atd17635022020
or
at:m112=64d17635022020
Look for the call progress (connect 64000) message.
Look for, or start sending, application data
MultiAccess Communications Server MA30120 User Guide
Appendix B – Modem Commands
159
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