The res_snmp.conf file is used to configure SNMP support in Asterisk. There are two options in the [general]. The subagent option specifies whether res_snmp should run as a subagent or a full SNMP agent. Asterisk defaults to running as a subagent. The enabled option specifies whether SNMP support in Asterisk is enabled. This defaults to no, so you’ll need to change this if you want SNMP support.