Hi All,
I thought it is a good idea to share the workaround my colleague came up with for this prolem. there is a file called syslog-entries.txt under /opt/CSCOpx/conf. he added all the entries we needed like :
local3.* /var/log/syslog_info
local5.* /var/log/syslog_info
the change was automatically reflected on syslog.conf
now we receve alerts from facilities 3 and 5 besides 7. hope this helps anyone who run into the same issue.