[amsat-bb] what did I hear?

Hi all, I'm just listening for a SO-67 pass and the satellite seems not operational at this time (8:40 UTC) but around 435.355 MHz +/- doppler I started hearing a kind of cw telemetry in short intervals. They are 6 letter "packets" or so, like ISUN44. I didn't copy other packets as I was busy trying to identify the satellite with the tracking program, but it must not be one of my "favourite" ones. What was I hearing? Thanks Frank IZ8DWF (currently in JM49MG).