Different modes of serving summons

According to order V, rule 9, where the defendant or his agent empowered to accept the service resides within the jurisdiction of the court in which suit is instituted, the summons must be delivered or can be sent to the proper office to be served or sent to a court approved courier service. According to sub rule 3, such as service can be made by delivering or even transmitting a copy by registered post because of either the defendant or such agent by Speed Post or even a courier service.