Tony
I think one of the problems is that there is no res_snmp.so in /usr/lib64/asterisk/modules. When I try to load it from the CLI I get
*CLI> module load res_snmp.so
Unable to load module res_snmp.so
Command 'module load res_snmp.so' failed.
[2013-05-31 10:10:05] WARNING[4240]: loader.c:409 load_dynamic_module: Error loading module 'res_snmp.so': /usr/lib64/asterisk/modules/res_snmp.so: cannot open shared object file: No such file or directory
[2013-05-31 10:10:05] WARNING[4240]: loader.c:874 load_resource: Module 'res_snmp.so' could not be loaded.