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Calls

A call is a communication session between two endpoints: a local endpoint and a remote endpoint. Microsoft Unified Communications Managed API (UCMA) 3.0 represents the call concept by the Call abstract class, and provides non-abstract classes that implement three specific types of calls.

  • InstantMessagingCall class.

    An InstantMessagingCall instance is used in a communication session for which the media type is Message, or text.

  • AudioVideoCall class.

    An AudioVideoCall instance is used in a communication session for which the media type is Audio.

    Important note Important

    The default media provider for the AudioVideoCall class does not support the Video media type.

  • BackToBackCall class.

    A BackToBackCall instance represents a logical SIP network element that mediates SIP signaling between two call legs. A BackToBackCall instance can be used to connect two clients that send and receive audio alone or audio and video.

This section describes common operations that a UCMA-based application performs on calls.

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