Syslog; Figure 15 : Syslog Protocol - Grandstream Networks GXP21 Series Security Manual

Syslog

The GXP supports sending Syslog to a remote syslog server. By default, it's sent via UDP and we
recommend changing it to "SSL/TLS" so the syslog messages containing device information will be sent
securely over TLS connection.

Figure 15 : Syslog Protocol

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GXP Security Guide