Hi,
Please double check if call park service started on FE Server, if not, start it. If yes, restart it.
Check if set the right voice policy to enable call park function for the test users.
Call park orbits must not be normalized. Verify that your normalization rules do not include any of your orbit ranges. If necessary, create additional normalization rules to prevent orbits being normalized.
You can check the call park setting with the help of the link below:
https://technet.microsoft.com/en-us/library/gg398283.aspx
Best Regards
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Eason Huang
TechNet Community Support
