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You cannot make Lync audio calls or you experience poor ...
https://support.microsoft.com/en-us/topic/you-cannot-make-lync-audio-calls-or-you-experience-poor-audio-or-video-quality-in-office-365-dedicated-or-itar-5ee0a254-ed8a-9ac0-9570-21ffaa0b9569#:~:text=For%20the%20best%20connection%2C%20the%20proxy%20and%20firewall,see%20the%20following%20Microsoft%20TechNet%20website%3A%20USB%20Peripherals
Lync Server 2013 port requirements - Lync Server ...
https://docs.microsoft.com/en-us/previous-versions/office/lync-server-2013/lync-server-2013-port-requirements
Lync Server requires that specific ports on the firewall be open. Additionally, if Internet Protocol security (IPsec) is deployed in your organization, IPsec must be disabled over the range of ports used for the delivery of audio, video, and panorama video.
Lync Server 2013: Ports and protocols for internal servers ...
https://docs.microsoft.com/en-us/previous-versions/office/lync-server-2013/lync-server-2013-ports-and-protocols-for-internal-servers
You cannot make Lync audio calls or you experience poor ...
https://support.microsoft.com/en-us/topic/you-cannot-make-lync-audio-calls-or-you-experience-poor-audio-or-video-quality-in-office-365-dedicated-or-itar-5ee0a254-ed8a-9ac0-9570-21ffaa0b9569
Determine whether you are connecting behind a proxy or firewall. For the best connection, the proxy and firewall should have port 443 and ports 50000-59999 open to all traffic. Make sure that the audio/video device that is being used is approved and certified to work with Lync 2010.
Lync to Lync Federation Firewall Ports Requirements
https://social.technet.microsoft.com/forums/lync/en-US/4489aca9-8fa1-47a7-9b9b-5f36e7ffbcbc/lync-to-lync-federation-firewall-ports-requirements
Can anyone please mention the ports required for Lync to Lync federation? Do i need the port range 50000-59999 (TCP&UDP) open on both the firewalls even though both deployments are Lync 2010? Microsoft has confirmed for 2013 and Skype for Business 2016 - Ports TCP/UDP 50,000-59,999 ARE required. Date: Jan 7th 2016
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