Method and network device establishing a binding between a plurality of separate sessions in a network

Network device comprising

• a processor,
• wherein the processor is adapted
• to store a first identity of a first level in a register;
• to store a second identity of a second level in the register;
• to provide a correspondence between the first identity and the second identity;
• to extract the second identity from a first message;
• to retrieve the first identity from the register corresponding to the extracted second identity;
• to reply with a second message comprising the first identity in response to the first message for establishing a binding between a first session of the first level and a second session of the second level on the basis of the retrieved first identity.

Network device comprising

• a processor,
• wherein the processor is adapted
• to send a first message comprising a second identity of the second level;
• to receive a second message comprising a first identity of a first level in response of sending the first message, wherein a correspondence between the first identity and the second identity is established;
• to send a third message comprising the first identity for establishing a binding between a first session of the first level and a second session of the second level on the basis of the first identity.

Network device comprising

• a processor,
• wherein the processor is adapted
• to receive a first message comprising a first identity of a first level from a network device of a second level;
• to establish a binding between a first session of the first level and a second session of the second level on the basis of the first identity.

Network device comprising

• a processor,
• wherein the processor is adapted
• to receive a first message comprising a second identity of a second level;
• to forward the first message to a register;
• to receive a second message comprising a first identity of a first level in response to the first message, wherein a correspondence between the first identity and the second identity is established for a session binding between a first session of the first level and a second session of the second level on the basis of the first identity.