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HMP Linux 1.2 Release Update, Rev 05 — September 2006September 2006 36
• When recording VOX files, the data format is specified in DC_XPB rather than through the
dx_setparm( ) function.
• Voice data files that are specified in the DX_IOTT structure must be opened with the
O_BINARY flag.
• If both time slots transmit a DTMF digit at the same time, the recording will contain an
unintelligible result.
• Since this function uses dx_listen( ) to connect the channel to the first specified time slot, any
error returned from dx_listen( ) will terminate the function with the error indicated.
• This function connects the channel to the time slot specified in the SC_TSINFO data structure
sc_tsarrayp[0] field and remains connected after the function has completed. Both
sc_tsarrayp[0] and sc_tsarrayp[1] must be within the range allowed in SC_TSINFO. No
checking is done to verify that sc_tsarrayp[0] or sc_tsarrayp[1] has been connected to a valid
channel.
• Upon termination of the dx_mreciottdata( ) function, the recording channel continues to
listen to the first time slot (pointed to by sc_tsarray[0]).
• The application should check for a TDX_RECORD event with T_STOP event data after
executing a dx_stopch( ) function during normal and transaction recording. This will ensure
that all data is written to the disk.
• When using dx_mreciottdata( ) and a dial tone is present on one of the time slots, digits will
not be detected until dial tone is no longer present. This is because the DSP cannot determine
the difference between dial tone and DTMF tones.
• Tone termination conditions such as DTMF and TONE apply only to the primary input of the
function; that is, the TDM time slot specified in the SC_TSINFO data structure
sc_tsarrayp[0] field.
Errors
If the function returns -1, use the Standard Runtime Library (SRL) Standard Attribute function
ATDV_LASTERR( ) to obtain the error code or use ATDV_ERRMSGP( ) to obtain a descriptive
error message. One of the following error codes may be returned:
EDX_BADDEV
Invalid device handle
EDX_BADIOTT
Invalid DX_IOTT entry
EDX_BADPARM
Invalid parameter passed
EDX_BADTPT
Invalid DV_TPT entry
EDX_BUSY
Busy executing I/O function
EDX_SYSTEM
Error from operating system