7b7c4f6f_various_Reason_Codes_indicate___Description
[Reason Code] 151 [Reply Flag (SCMP)] ETIMEOUT [Possible Action] To avoid duplicating the transaction, do not resend the request until you have reviewed the transaction status in the Business Center. See the documentation for your CyberSource client (SDK) for information about how to handle retries in the case of system errors. [Description] 
Error - The request was received but there was a server timeout. This error does not include timeouts between the client and the server.
CyberSource Support Center - What do the various Reason Codes indicate?
Description