Does Solaris 10 syslogd Daemon have an option to allow both - RFC-3164, and RFC-5424 syslog type messages to be accepted by the syslog server.
RFC-3164 is an older syslog protocol which has been superceded by the latest RFC-5424. I have both type devices reporting to my syslog server.
I'm going to go out on a limb here and say that the built-in syslogd in Solaris 10 does not support RFC-5424-style messages. The manpage for syslogd on my Solaris 10u10 system has it dated Oct 2008 and RFC-5424 was issued in 2009. You will probably need to install syslog-ng or rsyslog to trap those messages.