Patent ID: 9716655
Date: 2017-07-25
CPC Classifications: H04L,H04W

Claim:
1. A method of processing requests in a telecommunications network, the method comprising: maintaining a blacklist for determining routing attempts to be conducted during a default routing attempt procedure, the blacklist comprising a list of destination addresses which have been determined as being currently unavailable for routing requests to; receiving a request comprising an identifier for a given destination for the request; in response to performing a destination address lookup for the identifier, receiving a set of one or more destination addresses for routing the request to; comparing the one or more destination addresses in the set to the list of determined currently unavailable destination addresses on the blacklist; if the comparison indicates that at least one of the one or more destination addresses in the set is not present on the blacklist, processing the request according to a default routing attempt procedure; and if the comparison indicates that all of the one or more destination addresses in the set are present on the blacklist, processing the request according to an alternative routing attempt procedure, wherein the alternative routing attempt procedure comprises attempting to route the request to at least one of the determined currently unavailable destination addresses on the blacklist which are also in the set, and in the case of determining that a destination address in the set has become available for routing requests to, deleting the destination address which has become available from the blacklist.