when I am sending IAM message, every time I m receving CFN message brfore ACM. On this connectivity, I have less CSR and ASR issue. Please let me know is that CFN message can effect on CSR and ASR..
CFN is a confusion message based on ISDN. Generally, CFN is generated as a result of a protocol error. The generated CFN will encourage the node (in your case the MSC) to re-send the message, e.g. IAM.