VoIP Detective is capable to capture, decode and reconstruct VOIP sessions (RTP sessions). It allows the play back of voice calls on network. Besides, all the voice calls content can be stored and backup for further reference purpose. The supported protocols include SIP (technology that is most commonly used) and H.323. The supported CODECs include G.729, G.711-a law and G.711-u law, G.723, G.726 and ILBC.