## Connection Factory Object Properties > Message Header Overrides

Use this tab to override JMS message header fields that specify the persistence, lifetime, and priority of messages. Because overriding these values may interfere with current users or application designers, please coordinate with them before making these changes.

Override JMSDeliveryMode Specifies whether client-set JMSDeliveryMode field can be overridden. Default: false.

JMSDeliveryMode value Specifies the override value of JMSDeliveryMode. Values are 1 (non-persistent) or 2(persistent). Default: 2.

Override JMSExpiration Specifies whether client-set JMSExpiration field can be overridden. Default: false.

JMSExpiration value Specifies the override value of JMSExpiration (in milliseconds). Default: 0 (does not expire).

Override JMSPriority Specifies whether client-set JMSPriority field can be overridden. Default: false.

JMSPriority value Specifies the override value of JMSPriority (an integer from 0 to 9). Default: 4 (normal).

Override Messages To Temporary Destinations Specifies whether overrides apply to temporary destinations. Default: false.