Represents a contact that can be published or organized into groups.
Assembly: Microsoft.Rtc.Collaboration (in Microsoft.Rtc.Collaboration.dll)
A contact represents a unified communications user who is identified by a SIP URI. The endpoint owner can add, remove, or modify properties of a contact or organize them into logical entities called groups. Contacts can belong to more than one Group.
Adding someone as a contact does not automatically indicate that their presence information is subscribed to.