a method for aggregating or combining signaling messages for the adaptation of resource reservations required for route modifications is provided . according to the method , a modification of an inter - domain route requiring an adaptation of resource reservations is disclosed to a first routing domain . the first routing domain communicates the modification of the inter - domain route to at least a second and a third routing domain . resource reservations adapted according to the route modification are then disclosed by the second and the third routing domains to the first routing domain and are combined in order to be transferred to a fourth routing domain . according to one form of embodiment , a timer is used to define the period of time for combining reservation messages , in order to be able to transfer modified reservations in a more efficient manner .