Merge pull request #253779 from sloanster/patch-36

Update network-requirements.md

Author: prmerger-automator[bot]

articles/communication-services/concepts/voice-video-calling/network-requirements.md

@@ -83,7 +83,7 @@ You might want to optimize further if:
 | Network optimization task | Details |
 | :-- | :-- |
 | Plan your network | In this documentation, you can find minimal requirements to your network for calls. Refer to the [Teams example for planning your network](/microsoftteams/tutorial-network-planner-example). |
-| External name resolution | Be sure that all computers running the Communication Services SDKs can resolve external DNS queries to discover the services provided by communication servicers and that your firewalls aren't preventing access. Ensure that the SDKs can resolve the addresses *.skype.com, *.microsoft.com, *.azure.net, *.azureedge.net, *.office.com, and *.trouter.io. |
+| External name resolution | Be sure that all computers running the Communication Services SDKs can resolve external DNS queries to discover the services provided by communication servicers and that your firewalls aren't preventing access. Ensure that the SDKs can resolve the addresses *.skype.com, *.microsoft.com, *.azure.net, *.azure.com, and *.office.com. |
 | Maintain session persistence | Make sure your firewall doesn't change the mapped network address translation (NAT) addresses or ports for UDP.
 Validate NAT pool size | Validate the NAT pool size required for user connectivity. When multiple users and devices access Communication Services by using [NAT or port address translation](/office365/enterprise/nat-support-with-office-365), ensure that the devices hidden behind each publicly routable IP address don't exceed the supported number. Ensure that adequate public IP addresses are assigned to the NAT pools to prevent port exhaustion. Port exhaustion contributes to internal users and devices being unable to connect to Communication Services. |
 | Intrusion detection and prevention guidance | If your environment has an [intrusion detection system](../../../network-watcher/network-watcher-intrusion-detection-open-source-tools.md) or intrusion prevention system deployed for an extra layer of security for outbound connections, allow all Communication Services URLs. |