I think there were some post on the past about this topic. Today 10/28/2010 on the AO-27 pass around 2049z we heard some signal of two people getting into the satellite, I was able to recognize the accent and they were from Central or South America as I can hear they were talking about the results from a medical testing that makes me think about a hospital or a medical laboratory. the satellite reach it's high altitude from me at 45 degrees they no longer interfere, thats when the Central America region went out from the foot print,

Last year in Mexicali Mexico we spot a company that uses ISS down link freq 145.800 Mhz to communicate on simplex, as soon as we get their phone number by monitoring for a few days we give them a courtesy call and they politely agree to change their operating freq.

I did not record the audio from this pass but would like to get it to see if we can get more details.

73's Larry KI6YAA