SIPtap a SIP Call Monitoring Demonstrator

VoIPcode.org wants to raise public awareness of how dangerously vulnerable VoIP phone calls are to unauthorised wiretapping. While telephone calls on the standard phone network (PSTN) may be monitored, access to the telephone companies networks is tightly controlled making unauthorized wiretapping virtually impossible. In most countries even the law enforcement authorities need to obtain the correct legal authorisation. Voice over IP (VoIP) changes all this. As the name suggests, VoIP calls run over an IP network. IP networks are much more open than the PSTN, this means that VoIP calls can be intercepted and monitored much more easily than PSTN calls.

The real threat will be intercepts by organised crime, hackers, and anyone else who wants to listen to your VoIP phone calls. All they have to do is to monitor the IP network at some point between the caller and call recipient. The monitoring point can be the corporate network, an unscrupulous ISP or a local PC infected with spyware. The recordings of monitored calls can be organised, indexed and remotely browsed from anywhere in the world. We present a simple "proof of concept" call monitor here.

The call recordings indexed and listed on this page have been generated by SIPtap, a configurable SIP monitoring utility that may be used for the controlled recording of selected SIP calls. All calls made to the listed VoIP numbers and URIs are recorded by SIPtap, filed by date and indexed by caller, call recipient and SIP Call-ID.

Monitored VoIP Numbers

The Recordings

VoIP eavesdropping recordings exist for the following dates.

October 2007 S M T W T F S   1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31	November 2007 S M T W T F S         1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30	December 2007 S M T W T F S             1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
January 2008 S M T W T F S     1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Disclaimer:

This page and the utilities employed to generate it are provided purely to illustrate the ease with which VoIP calls can be monitored and the subsequent risk of unauthorised eavesdropping on those calls. VoIPcode.org accepts no responsibility or liability arising from the use of this demonstration capability or for any calls made to the identified VoIP phones and numbers that are monitored by this demonstrator.