Select an Oracle Communications (Acme Packet) 6350 (2016) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and locate apSysGlobalConSess under the apSysMgmtMIBGeneralObjects branch of APSYSMGMT-MIB, then select it and click OK. It reports the current total number of concurrent sessions active on the appliance. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is an Integer32-type OID, Value bounds is the most useful condition here — trigger an alert if concurrent sessions exceed 80% of the appliance's licensed/rated session capacity, giving you advance warning before you hit a hard session limit. Click Finish to create the monitor; you can adjust any parameter later.