Metaswitch Networks Limited

Max Dymond

Andy Tylee

George Malcolm Gilbert

Phillip James Springett

Ryan Peter Norris

Oliver Edward Pratt

Colin Michael Treganza Dancer

Proxying Session Initiation Protocol (SIP) communications in a load balancing device. An outgoing SIP message is received from a session border controller device. The received outgoing SIP message comprises a routing control parameter in the form of a Uniform Resource Identifier (URI). The received outgoing message comprises one or more additional outgoing routing control parameters different to the URI. The one or more additional outgoing routing control parameters have been originated at the session border controller device to control one or more outgoing routing characteristics at the load balancing device. The one or more additional outgoing routing control parameters are extracted from the received outgoing SIP message. The outgoing SIP message is forwarded to a peer device using the one or more outgoing routing characteristics on the basis of the one or more extracted outgoing routing control parameters.

Proxying session initiation protocol (SIP) communications

The application relates to systems, devices and methods for controlling enablement of resources based on a number of tokens in a token store. A resource is enabled when a number of tokens in the token store is greater than a minimum value. The resource is disabled when the number of tokens in the token store is not greater than the minimum value. When used in combination with an authorisation source, such as an authorisation source stored on a server or storage means, the token store provides a grace period during which the resource is enabled, even if the authorisation source is unavailable due to network or hardware failure, or disconnection of the storage means, for example.

Controlling enablement of resources

Measures for use in routing data in a data communications network. A request to route data to a given destination in the network is received. A route to the given destination is first selected from a plurality of routes to the given destination stored in a routing table. Routing the data to the given destination using the first selected route is attempted. In response to receipt of an indication that routing the data to the given destination via the first route failed, a second, different route to the given destination is second selected from the plurality of routes to the given destination stored in the routing table. The second selecting includes omitting, for the purposes of the second selection, at least one route to the given destination from the plurality of routes to the given destination stored in the routing table.

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Enfield, United Kingdom

Max Dymond