Edit syslog.conf.

$ sudo vi /etc/syslog.conf  # maybe /etc/rsyslog.conf

Add this:

local6.*                -/var/log/SIP_evergreen.log

Syslog expects the logfile to exist so create the file.

$ sudo touch /var/log/SIP_evergreen.log

Restart sysklogd.

$ sudo /etc/init.d/sysklogd restart

Edit logging config.

sudo vi /etc/syslog-ng/syslog-ng.conf

Add:

# +SIP2+ for Evergreen
filter    f_eg_sip { level(warn, err, crit) and facility(local6); };
destination eg_sip { file("var/log/SIP_evergreen.log"); };
log { source(s_all); filter(f_eg_sip); destination(eg_sip); };

Syslog-ng expects the logfile to exist so create the file.

$ sudo touch /var/log/SIP_evergreen.log

Restart syslog-ng

$ sudo /etc/init.d/syslog-ng restart