FOR SIMPLE/PLAIN USAGE that is for some auto and simple working , for example,Fax,record voice,and some short reply message there is no need to go for a costly / expensive solution like IVR , it can be achieved/done in other ways but as I have mentioned earlier that if the queries or calls are database related then u need an IVR. For simple messages and call hold to reduce the number of calls landing on the live agents or to give some delay to the callers we can have other simpler and cost effective solutions.