DicomObjects.NET supports extended negotation of user identity as defined in DICOM supplement 99:

A Meta SOP class is used where it is required to negotiate a “set” of SOP Classes as a batch, as one would not be useful without the others. The Meta SOP classes still used in DICOM are:

Transfer Syntax Negotiation in DICOM is relatively simple, but often misunderstood.

Transfer Syntax Negotiation in DICOM is relatively simple, but often misunderstood.

The mechanism is quite different for the simple Send methods compared to using DicomConnection

Extended negotiation allows “options” to be negotiated between 2 Application Entities as part of Negotiation.