1. Shelby, Z., Hartke, K., Bormann, C.: Constrained Application Protocol (CoAP). IETF Internet-Draft draft-ietf-core-coap (May 2013),
http://tools.ietf.org/id/draft-ietf-core-coap
2. Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., Schooler, E.: SIP: Session Initiation Protocol. RFC 3261 (Proposed Standard) (June 2002); Updated by RFCs 3265, 3853, 4320, 4916, 5393, 5621, 5626, 5630, 5922, 5954, 6026, 6141, 6665, 6878 (June 2002)
3. Roach, A.B.: Session Initiation Protocol (SIP)-Specific Event Notification. RFC 3265 (Proposed Standard) (June 2002); Obsoleted by RFC 6665, updated by RFCs 5367, 5727, 6446
4. Hartke, K.: Observing Resources in CoAP. IETF Internet-Draft draft-ietf-core-observe (February 2013),
http://tools.ietf.org/id/draft-ietf-core-observe
5. Shelby, Z., Krco, S., Bormann, C.: CoRE Resource Directory. IETF Internet-Draft draft-ietf-core-resource-directory (June 2013),
http://tools.ietf.org/id/draft-ietf-core-resource-directory