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Example: DND Treatment Do-Not-Disturb is largely non-interoperable since there are many ways to signal it from the phone to the server Set a presence status XCAP Automatically reject calls with some 6xx or 4xx code Many possible treatments of a call that is DND Send to voicemail Custom IVR Redirect to email Phone to server interoperability not dependent on selection of treatment, only on signaling it on/off So: don’t standardize what a server does on DND, just how to signal it, allowing for local innovations |