A COMMUNICATION METHOD, A SYSTEM AND A NAME RESOLVING SYSTEM

摘要

The invention relates to a method, a system and a name resolving system for an inter-service-provider-IP- backbone comprising a name resolving system (400) and a proxy (150), wherein a query for a receiving operator (201, 301) is made to the name resolving system (400) in order to send data relating to an SIP service to a subscriber of the receiving operator (201, 301). According to the invention a source (101) for the query is determined, whereby depending on the source, a response is returned with an address either to the proxy (150) or to the receiving operator (201).