We used Pivot to block calls based on CallerID and I think you can also use it for routing calls to different call flows. But there is no UI for it. Not sure how we can make an "APP" on Monster to create nice UI. Example pivot url: <?php header('content-type:application/json'); $callerID = $_REQUEST['Caller-ID-Number']; $callerID = trim($callerID, "+"); $callerID = preg_replace('/\D/', '', $callerID); $callerID = substr($callerID,-10); if(strcmp(strleft($callerID,3),"415")==0) { echo '{"module":"response" ,"data":{ "code":"486" ,"message":"User Busy" ,"media":"id_or_url" } }'; }else { echo '{"module":"callflow" ,"data":{"id":"somecallFlowID"} }'; } ?>