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This section describes using Connectivity Check to verify inbound and outbound service requirements for Cloud Connector Edition (CCE) and to check connectivity for interfacing with Microsoft Teams Direct Routing.

Running Connectivity Check

To check connectivity required for services and ports used with CCE and Teams, complete the following steps:

1. In the WebUI, click the Diagnostics tab.

2. In the left navigation pane, click Teams Direct Routing > Connectivity Check.

   

   
   

3. Specify the values for each field for the service for which you need to verify port readiness. For SIP/TLS (TCP), the primary and secondary server IP addresses are hard-coded (not editable).
   

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4. Click Apply. Service connectivity is checked and the Connectivity Check results display.

   

   
   For example, after connectivity is checked for DNS (TCP), the message:  "DNS TCP check on <ip address>: Port (<ip address:port number>) is open" displays in the Connectivity Check Results. A second result using the same format displays the results for the Secondary Server specified. For more information, refer to Working with Connectivity Check - Verifying Service and Port Requirements for CCE and Teams_Check_Results. 

   
   

5. Repeat Steps 3 and 4 for each service that requires verification of port readiness.

Connectivity Checks - Field Definitions

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Connectivity_Check_Fields Connectivity_Check_Fields

Specify the values for fields to specify the services for which Connectivity Check will verify port readiness.

Server Type

Destination

Primary Server

Secondary Server

Third Server

Destination Port

Connectivity Check - Results

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Connectivity_Check_Results Connectivity_Check_Results

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Connectivity Check Results Service and Protocol Port CCE Teams Direct Routing Description Connectivity Check Results Inbound SIP/MTLS (TCP) 5061 Image Removed Handles signaling for voice communications STUN (TCP) 443 Image Removed STUN/TURN negotiation of candidates STUN (UDP) 3478 Image Removed Determines the version of the Edge Server with which the Skype server is communicating SIP/TLS (TCP) 5061 Image Removed Image Added Handles signaling for voice communications; primary and secondary server IP addresses are hard-coded. RTP (UDP) 16384 - 17584 Image RemovedImage Removed Image Added Handles media for voice communications Outbound DNS (UDP/TCP) 53	Image Removed

Image Added	For the service that resolves the Public FQDN for the Microsoft Signaling Server, the Connectivity Check populates a default destination from the Host Name and Domain Name attributes in Host Information (that is, Web UI's Settings > System > Node-Level Settings). The tool opens the UDP socket and sends a homemade DNS packet.	If the remote server responds with a DNS response packet the port is reported as open. Otherwise, the port is reported as closed.
NTP (UDP)	123

Image Removed

Image Added	Service to support timestamps in certificate usage
HTTP (TCP)	80

Image Removed

		Certificate revocation check and Certificate Revocation List (CRL) retrieval The host field is filled by default with the FQDN found in the SBC certificate, under the attribute: CRL Distribution Point.
RTP (UDP)	49152-65535

Image Removed

Image Added	Handles media for voice communications
SIP/TLS (TCP)	5061

Image Removed

Image Added	Handles signaling for voice communications; primary and secondary server IP addresses are hard-coded. For Teams Direct Routing, the SIP target can be the Microsoft SIP signaling server; Connectivity Check routes to: sip.pstnhub.microsoft.com, sip2.pstnhub.microsoft.com, sip3.pstnhub.microsoft.com.
STUN (TCP)	443

Image Removed

		For the service handling STUN/TURN negotiation of candidates, the Connectivity Check opens a UDP socket and sends a homemade STUN packet.	If the remote server does not respond with a STUN error packet, the port is reported as closed. The remote peer is the Microsoft Cloud Edge Server and the STUN protocol determines the Public IP address.
STUN (UDP)	3748

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		For the STUN service that determines the version of the Edge Server with which the Skype server is communicating, Connectivity Check populates a default destination from from the Host Name and Domain Name attributes in Host Information (that is, Web UI's Settings > System > Node-Level Settings). The tool opens the UDP socket and sends a homemade DNS packet.	If the remote server responds with a DNS response packet the port is reported as open. Otherwise the port is reported as closed.
SIP/MTLS (TCP)	5061

Image Removed

Service to resolve Microsoft Signaling Server Public FQDN

For CCE, the Connectivity Check routes to sip

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