Longshine LCS-8156C1 - Manual (Page 101)

AT Commands for CX930xx Modem Reference Manual
102752B Conexant 3-77
Reporting Supported Options
The modem sends a string of information text to the DTE consisting of supported options
in response to the following command:
+ITF=?
The response is:
+ITF: (list of supported values),(list of supported values),(list of
supported values)
Example:
+ITF=?
+ITF: (0-255),( 0-255),(0)
The maximum reported value is the input transmit data buffer level at which the
modem signals a transmit data overrun indication to the DTE.