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  • Hello,

    Base on your description, I know that the remote user cannot share desktop with internal user.
    If I mislead your concern, please be free to let me know.

    Does this issue occur on all remote users, or some special account?

    From the error message "Call failed to establish due to a media connectivity failure when one endpoint is internal and the other is remote", please double check the firewall settings and ensure TCP 50000-59999 port and UDP 3478 port.

    Here's a similar link about this error, for your reference:
    http://silbers.net/blog/2011/12/09/lync-edge-hairpin-requirement/
    Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

    Best Regards,

    Allen Wang


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Friday, May 26, 2017 9:55 AM
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    Friday, June 9, 2017 12:04 PM
  • This is an issue with Web-ConferencinG and PSOM Ports. Please check access to PSOM ports (TCP/443) for your edge server.

    Saturday, June 10, 2017 4:50 AM
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    Monday, June 12, 2017 11:20 AM