Solution Registration failed due to STUN server (DNS resolving or connection) error (59) Zoiper

Once I installed the Zoiper application on the iPhone to connect to the telephony server and found an error:

Registration failed due to STUN server (DNS resolving or connection) error (59)

At first I thought the problem was with DNS and indicated the IP address instead of the domain, but the error repeated, sometimes the SIP registration was successful, but for a very long time.

To solve this problem, I disabled STUN, right in the SIP number settings, by opening “Network settings” below and unchecking “Enable STUN”.
After that, the SIP registration was successful and instant.

See also my article:
Installing Asterisk on Ubuntu

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