Abstract OSS Interconnection Gateway Validation, Volume 6: Gateway Security E.P. de Vink (ed.) This volume looks at the appraisement of gateways regarding security threats that are predicted to be relevant to European operators working in a regulated environement. There has been special attention given to defining boundaries between domains of governance by using gateways as trusted entities. The main benefits of using gateways are reduced costs and the focussing of interconnect at a limited number of points where exhaustive and costly security analysis can be justified and carried out efficiently. This can be done whilst supporting resilience (no single point of failure), accessibility and alternative routes based on business rules. This volume contains a logical sequence of security processes that need to be carried out by gateway operator of any size.