playback speex codec in VOIP rtp player?

I have captured a very important VOIP conversation on my magicjack line but the codec that was used was speex. Is there anyway to get the wireshark voip rtp player to play this call properly instead of just silence? I am open to using another program if that is the only option but I really have no clue where to start if that is even an option. Any help will be appreciated thank you for your time. By the way in case it matters I am running windows 7 64bit.