chatstate doesn't work with Psi
I don't know if it is a Gajim bug or a Psi one but it seems that chatstate does not work between these two client and Psi is supposed to use JEP-0085 since 0.9.3 (http://flyspray.psi-im.org/index.php?do=details&id=80)
I've also posted a bug report on Psi's bug tracker.