problems to add sites in voip module

Hi, I have installed Voip module, and I have running IP SLA and IP SLA Proactive Threshold Monitoring in one of our customer network. Through solarwinds syslogs we see whenever a threshold is reached. The problem that we have is we can not add those devices to the module: the error we get is:

Add VoIP Site

IP SLA is not supported for coldwell-bankers-cupey. More information on Cisco IOS Software IP SLA’s is available at www.cisco.com/go/ipsla. For hardware and software requirements, visit www.cisco.com/go/fn and select "IP SLAs - UDP Based VoIP Operation" as the feature.

 how can we put devices in voip module to measure jitter and latency?

Thanks.