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Cannot make call RRS feed

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    Hi,<o:p></o:p>

    I have Problem With My Skype for Business Server 2019.

    External Users Can Log in To Skype for Business They Can Send And Receive Messages and IM But When They Call After Other User answer It Will Drop The Call and The Call Wont Happen<o:p></o:p>

    Any Idea.<o:p></o:p>

    <o:p></o:p>

    Monday, May 18, 2020 3:30 PM

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    Hi oui11sd!

    Does this issue persist all the time?

    What is your topology in the environment?

    Is the call between internal users normal?

    If you have deployed the edge server, we recommend you check again the edge configuration about A/V Edge ports: 3478(UDP),443(TCP),50000-59999(UDP/TCP) by running telnet command. Edge Server can help external users who aren’t logged into your organization’s internal network to be able to interact with internal users. It provides three external service, the A/V Edge service provide a way for your internal users to share audio and video with external users.

    Besides, you can also check if you have some error logs in your server to narrow down this issue.

    Best Regards,
    Jimmy Yang
    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.
    • Marked as answer by oui11sd Sunday, May 24, 2020 1:47 PM
    Tuesday, May 19, 2020 3:11 AM