Cracking encrypted VOIP?

Taken at face value, a claim to have cracked voice encryption programs in minutes sounds pretty melodramatic, when in fact it appears the hacker has merely intercepted the 'plaintext' (plainvoice? Plainaudio? Plaingab?) en route to/from the encryption software at the client end, using a Trojan. The same kind of trick would probably work against most encryption systems unless they physically and logically secure the plaintext streams.