A method of operating a master node to provide dual connectivity in an EN-DC handover of a user equipment, UE, from a source secondary node to a target secondary node in a new radio, NR, telecommunications system, wherein the master node is a long-term evolution, LTE, node and the target secondary node is a NR node the method comprising: sending , from the master node and to the target secondary node , an addition request message to allocate resources for the UE in the handover; receiving an addition request acknowledgement message from the target secondary node , wherein the addition request acknowledgement message comprises a context indication regarding a full radio resource control, RRC, context or a delta RRC context, wherein the delta RRC context comprises data that is updated relative to data in a current UE context; based on the received context indication, sending , from the master node, a message including the context indication to the UE; wherein, responsive to the context indication comprising a full RRC context, the message sent to the UE includes a flag to release a previous EN-DC configuration and add the full RRC context to the UE; and wherein, responsive to the context indication comprising a delta RRC context, the message does not include an indication to release EN-DC configuration; wherein UE context comprises a master cell group, MCG, configuration portion and a secondary cell group, SCG, configuration portion, and wherein, responsive to a master target node being able to process the MCG portion configuration and the secondary target node not being able to process the SCG configuration portion, the master node releases the delta RRC context corresponding to the MCG configuration portion to the target master node and the full RRC context corresponding to the SCG configuration portion to the secondary target node. sending , from the master node and to the target secondary node , an addition request message to allocate resources for the UE in the handover; receiving an addition request acknowledgement message from the target secondary node , wherein the addition request acknowledgement message comprises a context indication regarding a full radio resource control, RRC, context or a delta RRC context, wherein the delta RRC context comprises data that is updated relative to data in a current UE context; based on the received context indication, sending , from the master node, a message including the context indication to the UE; wherein, responsive to the context indication comprising a full RRC context, the message sent to the UE includes a flag to release a previous EN-DC configuration and add the full RRC context to the UE; and wherein, responsive to the context indication comprising a delta RRC context, the message does not include an indication to release EN-DC configuration; wherein UE context comprises a master cell group, MCG, configuration portion and a secondary cell group, SCG, configuration portion, and wherein, responsive to a master target node being able to process the MCG portion configuration and the secondary target node not being able to process the SCG configuration portion, the master node releases the delta RRC context corresponding to the MCG configuration portion to the target master node and the full RRC context corresponding to the SCG configuration portion to the secondary target node. <EOS>