SMS gateway options

The SMS options set directly under  establish general values, and global defaults. In particular, the  option enables the SMS gateway on   startup.

See also:
 * enable Option
 * max_conns Option
 * debug Option
 * foreground Option
 * unittest Option
 * history_file_directory Option
 * history_file_mode Option
 * history_file_rollover_period Option
 * record_lifetime Option
 * history_file_flush_period Option
 * history_file_flush_threshold Option
 * thread_count_initial Option
 * thread_count_maximum Option
 * thread_stack_size Option
 * SMS gateway_profile options
 * SMS smpp_relay options
 * SMS smpp_server options
 * SMS options