Dynamic DNS (DDNS or DynDNS) is a method of automatically updating a name server in the Domain Name System (DNS), often in real-time, with the active DDNS configuration of its configured hostnames, addresses or other information.
Step 1 : configuration > Management > Dyndns > Add > Enable services
Step 2: Select provider there was multiple provide also available
Step 3: Method it will reach the communicate the DynDNS provider in this USE WEB or Default route interface IP
Step 4: Mention the Dyndns server IP where u host and enter the credentials
Step 5: In Dyn, record name mention the create the DNS name for reach the server
Note:1) This is not RDP over VPN or hosted in cloud platform.2) No changes to your office network or any additional program to run in tally server