Author of initial tutorial: Davy Van De Moere <firstname.lastname@example.org>
An attempt to give a full overview of security risks a SIP Router is confronted with.
Quoting shamelessly from RFC3261 Chapter 26:
SIP is not an easy protocol to secure. Its use of intermediaries,
its multi-faceted trust relationships, its expected usage between
elements with no trust at all, and its user-to-user operation make
security far from trivial.
1. Registration Hijacking (rfc3261)
2. Impersonating a Server (rfc3261)
3. Tampering with Message Bodies (rfc3261)
4. Tearing Down Sessions (rfc3261)
5. Denial of Service and Amplification (rfc3261)
6. Scanning attacks
7. Session re-use