Method for the management of handover roaming in a communication system comprising a first LPWAN network of a first operator and a second LPWAN network of a second operator, the first network comprising: - subnetworks each comprising at least one convergence node (174, 175; 190, 191) and communication nodes (170, 171, 172; 180, 181, 182) integrating gathering gateways (123, 124, 125; 127, 128, 129), the subnetworks implementing separate respective transport protocols, - a first server , for each subnetwork , responsible for managing said gathering gateways (123, 124, 125; 127, 128, 129) included in said subnetwork , each gathering gateway communicating via a single convergence node associated with an associated single first server, and - a second server , coupled to any first server , responsible for controlling the MAC layer for end devices communicating via said gathering gateways (123, 124, 125; 127, 128, 129) of the first network; the second network comprising: - a third server responsible for interfacing a fourth server and a fifth server with the second server of the first network, - the fourth server , which implements an application with which at least one end device of the second operator exchanges application data in the context of a subscription to services defined with the second operator, and - the fifth server , responsible for authenticating any end device seeking to join the communication system in order to benefit from the services of the fourth server ; the method being such that the communication system transports uplink frames including application data from said at least one end device of the second operator to the fourth server by successive relayings of a said first server , of the second server and of the third server when said at least one end device of the second operator is authenticated and furthermore such that said uplink frames are captured by at least one gathering gateway (123, 124, 125; 127, 128, 129) of the first network, the method being furthermore such that each gathering gateway (123, 124, 125; 127, 128, 129) of at least one subnetwork of the first network, which has detected an end device of the second operator requesting to join the communication system in order to benefit from the services of the fourth server communicates with the fifth server in order to authenticate said end device of the second operator detected, shortcutting the first server associated with said gathering gateway (123, 124, 125; 127, 128, 129), the second server and the third server by means of a communication interface also shortcutting the convergence node associated with said gathering gateway (123, 124, 125; 127, 128, 129). - subnetworks each comprising at least one convergence node (174, 175; 190, 191) and communication nodes (170, 171, 172; 180, 181, 182) integrating gathering gateways (123, 124, 125; 127, 128, 129), the subnetworks implementing separate respective transport protocols, - a first server , for each subnetwork , responsible for managing said gathering gateways (123, 124, 125; 127, 128, 129) included in said subnetwork , each gathering gateway communicating via a single convergence node associated with an associated single first server, and - a second server , coupled to any first server , responsible for controlling the MAC layer for end devices communicating via said gathering gateways (123, 124, 125; 127, 128, 129) of the first network; - a third server responsible for interfacing a fourth server and a fifth server with the second server of the first network, - the fourth server , which implements an application with which at least one end device of the second operator exchanges application data in the context of a subscription to services defined with the second operator, and - the fifth server , responsible for authenticating any end device seeking to join the communication system in order to benefit from the services of the fourth server ; <EOS>