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Applies to: Lync 2013 | Lync Server 2013
Microsoft Unified Communications Managed API 4.0 provides several classes to support the back-to-back user agent concept. The principal class of interest to application developers is the BackToBackCall class. Using back-to-back user agent functionality, an application can perform the following operations:
Create a BackToBackCall instance, which establishes back-to-back connectivity between two calls. For example, a customer and an agent are connected through a back-end call center.
Perform midway call control (transfer calls, park calls, play music to customers on hold) on an established back-to-back call.
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Other resources
video demo - Lync 2013: How to do back-to-back calls using UCMA 4