• Integrated support for Instant Messaging (IM)
  
  
• Integrated support for audio, with Secure Real-time Transport Protocol (SRTP), early media, and multiple codec selection
  
  
• Common telephony features enabled by means of a reusable signaling framework (transfers, forwards, caller on hold, and other operations)
  
  
• Integrated audio devices: recorder, player, tone controller for Dual-Tone Multiple-Frequency (DTMF), and connectors for speech recognition and speech synthesis
  
  
• Loose coupling between signaling and media, allowing back-to-back and scenarios such as media-enabled Web clients
  
  
• User impersonation
  
  
• Conferencing features (control and monitoring): anonymous user join, trusted user join
  
  
• Multimodal escalation-to-conference helpers for instant messaging calls
  
  Developers who implement a custom audio provider can provide support for escalation-to-conferencing for the custom media type.
  
  
• Platform extensibility by means of the factory-based Calland MediaProviderclasses
  
  Developers can extend the UCMA 2.0 Core SDK platform to handle a new media type by creating custom Call, MediaProvider, and MediaFlowsubclasses that work with the new media type.
  
  

• Conference retrieval from PSTN conference ID
  
  

• Publishing framework based on presence manifest
  
  (Note that in the UCMA 2.0 Core SDK the manifest is predefined, and follows the same rules for presence publication as Office Communicator 2007.
  
  
• Automatic user endpoint bootstrapping based on container manifest
  
  

The following features apply only to UserEndpointtype, not the ApplicationEndpointtype.

• Contact object registration
  
  
• Contact list creation and management
  
  
• Contact organizations in provided or custom groups