Cannot make A/V calls

MagicPowerSun1257 101 Reputation points
2020-08-30T15:13:01.543+00:00

Hi,

I've sort of successfully installed a Lync server, however, every time two clients attempt a call, either voice or video, the call fails with error: call failed due to network issues. I can't seem to find anything in the logs that could help me.

Skype for Business
Skype for Business
A Microsoft communications service that provides communications capabilities across presence, instant messaging, audio/video calling, and an online meeting experience that includes audio, video, and web conferencing.
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  1. JimmyYang-MSFT 49,191 Reputation points Microsoft Vendor
    2020-08-31T09:16:27.873+00:00

    Hi!

    Based on my knowledge, this issue can be caused from a number of different reason.

    In order to narrow down this issue, we recommend you firstly check the monitoring server reports for an error message.

    Also, please check the candidate information from the SIP packets during the call. If the candidate information is not being sent
    first thing to check is that the internal client can resolve the DNS host name of the Edge Server to the INTERNAL interface.

    Besides, don’t forget to check that the UDP port 3478 is open on the firewall between the internal Lync clients and the edge server running this service.

    https://www.myucthoughts.com/2012/07/call-failed-due-to-network-issue.html

    If the response is helpful, please click "Accept Answer" and upvote it.

    2 people found this answer helpful.
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