HISTORY_FILE_DIRECTORY

(string, absolute directory path) Absolute path to the directory to which to write the history files. The directory path will be created if it does not exist. The default value for this option is:

msg-svr-base/data/sms_gateway_cache/

The directory used should be on a reasonably fast disk system and have more than sufficient free space for the anticipated storage; see C.6 SMS Gateway Server Storage Requirements to change this option to a more appropriate value.