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When the Lync client is confi gured to run in UI Suppression mode, its interface is completely hidden from the user. Applications that use Lync UI Suppression are responsible for recreating those user interface elements from scratch. The Lync API with Lync running in UI Suppression mode is the recommended development pattern for applications you would have previously built with the UCC API.

Lync UI Suppression requires that the Lync client is installed on the user ’ s machine; this eliminates the complexity of managing the connectivity of the application back to the Lync server infrastructure. In UI Suppression, you use the Lync API to replicate some of the functionality available in the Lync client, such as signing users into Lync, retrieving their contact list, and starting and responding to conversations in different modalities.

When working with UI Suppression, you interact with conversations at the modality level —activating individual modalities manually, creating conversations, adding participants, and disconnecting the modalities when the conversation is completed. For example, you can build a Silverlight instant messaging client that provides a completely customized user interface for instant message conversations. In this case, you would be responsible for recreating application functionality and user interface elements such as a contact list and conversation window. You would work directly with the instant message modality, creating a conversation, connecting the modality, sending instant message text to participants, notifying participants when someone is typing, and delivering the instant message text to the participants in the conversation.

Using the Lync API with Lync running in UI Suppression mode, you can build compelling Lync - replacement solutions such as a custom instant messaging client, or a dedicated audio/video conferencing solution.

Source of Information : Wiley - Professional Unified Communications Development with Microsoft Lync Server