The present invention relates to a system and method of planning and managing real-time postal delivery work that formulates a delivery plan according to a delivery workload in real time, provides information about the delivery plan, and provides and manages information about collection work of returned and confirmed mail items. In some embodiments, a method in accordance with the present invention may include determining a rule regarding when focus shifts from a first device, or an application operating on the first device, to a second device, or an application operating on the second device, and changing focus from the first device to the second device or their respective applications in accordance with the rule. A predetermined amount of metal salt of carboxylic acid is included in the elastomeric compound during compounding. A second pump assembly is arranged in fluid communication with the ballast tank and is arranged for pumping sea water from the ballast tank through an outlet conduit assembly arranged after the second pump assembly. Where necessary, the Media Gateway, Media Gateway Control Function, and Call State Control Function further cooperate to emulate the functions of an anchor MSC of a circuit wireless system.