You can check what the current state of the radios on the ISS are here: https://www.ariss.org/current-status-of-iss-stations.html
Packet will make a "braaap"? sound. (Idk, it sounds like that too me), and voice modes, you will likely hear people calling. Nearly every pass people are trying to get in. Remember to adjust frequency for doppler, and open your squelch because the signals will start out weak. More info here: https://amsat-uk.org/beginners/how-to-hear-the-iss/