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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.

Service Requirements for CCE

The Connectivity Check feature verifies the following inbound and outbound service requirements for CCE:

Outbound:

• DNS (UDP/TCP 53): The Domain Name Service (DNS) resolves the Public FQDN of the Microsoft Signaling Server 
• HTTP (TCP 80): Hyper Text Transport Protocol (HTTP) is used for certificate revocation, and for Certificate Revocation List (CRL) check and retrieval
• STUN (TCP 443): Session Traversal Utilities for NAT (STUN)/Traversal Using Relays around NAT (TURN) is used for negotiation of candidates
• STUN (UDP 3478): STUN is used to determine the SBC Edge version with which the Skype server is communicating
• SIP/MTLS (TCP 5061): SIP and Multiplexed Transport Layer Security (MTLS) signaling are used for establishing outbound voice communication

Inbound:

• SIP/MTLS (TCP 5061): SIP and MTLS signaling are used for establishing outbound voice communications
• STUN (TCP 443): STUN/TURN is used for negotiation of candidates
• STUN (UDP 3478):  STUN is used to determine the SBC Edge version with which the Skype server is communicating

Service Requirements for Teams Direct Routing

The Connectivity Check feature verifies the following inbound and outbound service requirements for Teams Direct Routing:

Outbound:

• DNS (UDP/TCP 53): DNS resolves the Public FQDN of the Microsoft Signaling Server 
• NTP (UDP 123): NTP supports time in certificate usage
• SIP TLS (TCP 5061): Handles signaling for voice communication
• RTP (UDP 49152-65535): Handles media for voice communication

Inbound:

• SIP TLS (TCP 5061): Handles signaling for voice communication
• RTP (UDP 16384-17584): Handles media for voice communication

Running Connectivity Check

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