Thanks for the idea. It works but give me unwanted numeric at the beginning which I could write another eval expression to resolve that and work perfect. Here is the eval expression I added in.
| eval "cs"=case(CallRate<=250,"1.Under 250kps", CallRate<=500,"2.Under 500kps", CallRate<=750,"3.Under 750kps", CallRate<=1000,"4.Under 1000kps", CallRate<=1250,"5.Under 1250kps", CallRate>1250, "6.Above 1250kps") | stats count by cs| eval "cs"=replace('cs',"^(\d{1}).","")
| eval cs=cs+" -- "+count + "calls"
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