TeamSpeak server 3.1.0 introduces several improvements and enhancements to the licensing and accounting systems.
The TeamSpeak 3 server will now communicate with the accounting servers through HTTPS. The accounting address has changed and will require an update in your firewall rules to allow for HTTPS communication with accounting. It is possible to specify a proxy server to be used.
All TeamSpeak 3 servers will now require a license, existing licenses (AAL, ATHP, NPL) will automatically be updated to the new format. The server download will contain a default license for 32 slots, which will expire 6 months after release.
Once a sufficient amount of time has passed for ATHPs to update their servers, future clients will eventually lose the ability to communicate with 3.0.x servers.