Hello sancha08, You are not able to send a test message through syslog. Here are a couple of links to a couple of kb’s.  The first one is to EMC Unity: Alert Messages, ID List and Call home, & the second link is to How to send Security Audit log messages to syslog server. [URL] [URL]
Customer would like to know if he can send a test message through Syslog on Unity Array ? Syslog / splunk admins are telling they are not receiving messages. Is this possible? I couldn’t find any information on support search or KBs. I found only VMAX KB (53082 and 53082) and Connectrix (57296).  
Customer would like to know if he can send a test message through Syslog on 
Unity Array ?