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ATS5=27 designates ESC as the backspace character.
3.6 Modem AT Response Codes
Unless you have instructed the modem not to send response
codes by issuing command Q1, it will always send a response
code after executing a command line. The response code can be
displayed in word or in digit form depending on the V command
issued.
Command X0 to X4 lets you select different response sets of the
modem, which enables or disables certain response codes. In
general application, you can select X4, the default, which enables
all response codes so that the most specific response message
can be displayed. If you plan to write your own software for special
applications, you may select the response set you require by
issuing an appropriate X command.
The following table shows the response codes from 0 to 8 related
to each command. The means the response code is disabled for
the corresponding command. The remaining response codes are
enabled.