1. Pelagie, H., & Ernesto, D. (2011, October). Overcoming NAT traversal issue for SIP-based communication in P2P networks. In Wireless and Mobile Networking Conference (WMNC), pp. 1–8.
2. Chen, W.-E., Huang, Y.-L., & Chao, H.-C. (2008). NAT traversing solutions for SIP applications. EURASIP Journal on Wireless Communications and Networking, 2008, 1–10.
3. Wacker, A., Schiele, G., Holzapfel, S., & Weis, T. (2008). A NAT traversal mechanism for peer-to-peer networks. Peer-to-Peer Computing, 2008, 81–83.
4. Rosenberg, J., Mahy, R., Matthews, P., & Wing, D. (2008, October). Session Traversal Utilities for NAT(STUN). RFC 5389.
5. Boucadair, M., Penno, R., & Wing, D. (2013, July). Universal Plug and Play (UPnP) Internet Gateway Device, Internet Engineering Task Force, RFC 6970.