Specifications

MyPBX U5XX Administrator's Guide
www.yeastar.com Page 144
Step 8. Add other firewall rules by yourself. For example, if
you are using features about email, you should add the
firewall rules for the SMTP server and POP3 server.
Step 9. Enable Drop all (If this feature is enabled, all the
packets and connection that do not match the rules would
be dropped.)
Note: Before enable this feature, please add a rule to accept the local network
access, or the server might not be accessed.
Figure B-21
Step 10. The Configuration of firewall settings is completed.
See as below figure.