When you want to test a link from your office to another location, you need a Cisco router ( IOS version 12.4 or later ) at each end.
Steps to set up the monitor
Using OpManager, you can now monitor the voice and video quality of a 'call path'. Call path is the WAN link between the router in your main office and the one in the branch office that you want to monitor.
Step 1: Enable Add (/discover) the router in your LAN to OpManager. And make sure the SNMP read and write community are configured properly, for that router.
Step 2: Enable SLA responder on the destination device you wish to monitor, Steps are detailed below.
Router › enable
Router(config)#ip sla responder
Router(config)#ip sla monitor responder>
(Note: Enter any one of the command to enable IP SLA responder as it varies according to the IOS versions.)
Repeat the above steps for all the destination routers on which you want to monitor VoIP performance.
Step 3: Creating the VoIP monitor: