| 摘要 |
In order to facilitate the maintaining of associations re- quired in inter-domain communications, preferably name (41-1) and address information (41-2) on domains and in- formation on interworking agreements (41-3) between dif- ferent domains is maintained in a reliable network external to said domains. A network node (41) via which inter- domain traffic is routed is arranged to use said maintained information when checking whether or not a sender of a message is the one the sender claims to be and preferably also whether or not an agreement exists between the sender's domain and a receiver's domain. Provided that the sender is the claimed one, the message is forwarded, preferably to an address maintained for the receiver's do- main.
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