Some of the quality of service parameters are required on each call, if one of these is missing, an MMIOERR_UNSUPPORTED_MESSAGE error is generated.

The QOS parameters are kept as a list to allow future addition of quality parameters. "Quality of service" is being explored by the research community. With newer applications, changes to QOS parameters may be required. For each of the QOS parameters, the lQOSValue is one of the following values:

GUARANTEED

The application requests guaranteed service and if requested QOS is unavailable, the connection is not made.
DONTCARE
The applications requests the given QOS, but if it is unavailable, a connection may be made without quality of service reservation.
DONTRESERVE
The application does not want guarantees, (same as no message). The remaining fields are meaningless and not examined.

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