A method in a node of a Multi-Protocol Label Switching, MPLS, telecommunications network for addressing a particular function end point of a corresponding function, the method comprising the steps of: receiving a MPLS frame, the MPLS frame having a label stack comprising a first label and a second label, the first label being a tunnel label indicating that said node is the terminating node of an LSP tunnel, said LSP tunnel being the connection over which said MPLS frame has been received; comprising the steps of: determining whether the frame has reached its terminating node and, if so; checking the second label in the label stack to determine whether the second label is a Generic Associated Channel Label,GAL, and characterized in that, if so, acquiring a context descriptor constructed based on key attributes characterizing the terminated connection over which the frame has been received, the context descriptor comprising the first label, for use by an operations, administration and maintenance function during subsequent processing of the frame when performing connection verification, continuity checking or other functions where the identity of the origin of the frame is required; and routing the frame for Generic Associated Channel Header (G-ACH) processing in the node, together with the acquired context descriptor. receiving a MPLS frame, the MPLS frame having a label stack comprising a first label and a second label, the first label being a tunnel label indicating that said node is the terminating node of an LSP tunnel, said LSP tunnel being the connection over which said MPLS frame has been received; comprising the steps of: determining whether the frame has reached its terminating node and, if so; checking the second label in the label stack to determine whether the second label is a Generic Associated Channel Label,GAL, and characterized in that, if so, acquiring a context descriptor constructed based on key attributes characterizing the terminated connection over which the frame has been received, the context descriptor comprising the first label, for use by an operations, administration and maintenance function during subsequent processing of the frame when performing connection verification, continuity checking or other functions where the identity of the origin of the frame is required; and routing the frame for Generic Associated Channel Header (G-ACH) processing in the node, together with the acquired context descriptor. determining whether the frame has reached its terminating node and, if so; checking the second label in the label stack to determine whether the second label is a Generic Associated Channel Label,GAL, and characterized in that, if so, acquiring a context descriptor constructed based on key attributes characterizing the terminated connection over which the frame has been received, the context descriptor comprising the first label, for use by an operations, administration and maintenance function during subsequent processing of the frame when performing connection verification, continuity checking or other functions where the identity of the origin of the frame is required; and routing the frame for Generic Associated Channel Header (G-ACH) processing in the node, together with the acquired context descriptor.