Regarding this issue, agree with Shankar.Paulraj, even though you have a small organization because Group Call Pickup is built on the Call Park application, I will share a link with you https://technet.microsoft.com/en-us/library/jj945623.aspx
Regards,
Alice Wang
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Proposed as answer byAlice-WangFriday, March 31, 2017 9:09 AM