This reference article lists the ports required for access to the DNS and NTP core services. For more information on other ports and services you may need to configure on your firewall, see About ports and services for your firewall. 

Services Transport/Port (Application) Destination Description
DNS udp/53* (DNS)

tcp/53* (DNS)		 Corporate server† 

DNS provides name resolution for network connections. 

The DNS settings apply to:

  • Genesys Cloud client (browser and desktop app)
  • Genesys Cloud mobile app (iOS and Android)
  • VoIP phones
  • Edge devices
  • Bridge servers
NTP udp/123 (NTP) time.nist.gov† 

Provides time synchronization for Edge devices.
us.pool.ntp.org†

Provides time synchronization for Polycom phones.
* Typical. If your network is configured for private or internal DNS, then port 53 is not required.

† Third-party service – not hosted by Genesys Cloud.

Date Revision
December 14, 2020 Broke out the main sections of the larger Ports and services for your firewall article into smaller articles. Created this article to cover the ports for core services.