Going Bright: Wiretapping without Weakening Communications Infrastructure:
Mobile IP-based communications and changes in technologies have been a subject of concern for law enforcement, which seeks to extend current wiretap design requirements for digital voice networks. Such an extension would create considerable security risks as well as seriously harm innovation. Exploitation of naturally occurring bugs in the platforms being used by targets may be a better alternative.
Apparently VoIP implementations are so buggy that there’s no need for vendors to include backdoors!