Abstract: A network node, during setup of a communication session between a calling party and at least a called party, receives a first provisional response message from a first device comprising first session description protocol (SDP) data; and forwards it on to a calling party device associated with the calling party, the forwarded first provisional response message comprising at least a part of the first SDP data. The network node receives a second provisional response message comprising second SDP data from a second device. Responsive to receipt of the second provisional response message, the network node transmits, during communication session setup, a message to the calling party device which offers to update the SDP data; removes the second SDP data from the second provisional response message; and transmits the second provisional response message from which the second SDP data has been removed to the calling party device.

Abstract: 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.

Abstract: A network node, during setup of a communication session between a calling party and at least a called party, receives a first provisional response message from a first device comprising first session description protocol (SDP) data; and forwards it on to a calling party device associated with the calling party, the forwarded first provisional response message comprising at least a part of the first SDP data. The network node receives a second provisional response message comprising second SDP data from a second device. Responsive to receipt of the second provisional response message, the network node transmits, during communication session setup, a message to the calling party device which offers to update the SDP data; removes the second SDP data from the second provisional response message; and transmits the second provisional response message from which the second SDP data has been removed to the calling party device.

Abstract: Measures for use in processing communication sessions in a telecommunications network are provided. Each communication session has a signaling path spanning a plurality of devices including one or more intermediate network devices and at least two endpoint devices, the signaling path comprising a plurality of signaling segments, each segment being between two devices in the plurality of devices. A first signaling message, comprising a first identifier associated with the communication session, is received via a first signaling segment for a communication session. At least part of the first identifier is transformed using a deterministic encryption algorithm to generate a second identifier. A second signaling message, comprising the second identifier, is transmitted via a second signaling segment for the communication session to associate the second identifier with the communication session.

Abstract: 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.

Abstract: Measures for use in processing communication sessions in a telecommunications network are provided. Each communication session has a signaling path spanning a plurality of devices including one or more intermediate network devices and at least two endpoint devices, the signaling path comprising a plurality of signaling segments, each segment being between two devices in the plurality of devices. A first signaling message, comprising a first identifier associated with the communication session, is received via a first signaling segment for a communication session. At least part of the first identifier is transformed using a deterministic encryption algorithm to generate a second identifier. A second signaling message, comprising the second identifier, is transmitted via a second signaling segment for the communication session to associate the second identifier with the communication session.

Abstract: Measures for use in processing communication sessions in a telecommunications network are provided. Each communication session has a signalling path spanning a plurality of devices including one or more intermediate network devices and at least two endpoint devices, the signalling path comprising a plurality of signalling segments, each segment being between two devices in the plurality of devices. A first signalling message, comprising a first identifier associated with the communication session, is received via a first signalling segment for a communication session. At least part of the first identifier is transformed using a deterministic encryption algorithm to generate a second identifier. A second signalling message, comprising the second identifier, is transmitted via a second signalling segment for the communication session to associate the second identifier with the communication session.