[App_rpt-users] No courtesy tone from IAX2 client ?

Hi, I've got a single node, with a duplex TRX, and IAX2 client. I have two users : - a radio user - an IAX2 client (Zoiper), operating in "vox" mode. When the radio user unkeys, the correct courtesy tone (unlinkedct) is sent, to both users. When the IAX2 client unkeys ("mute" button), the courtesy tone (linkunkeyct) is never sent. I tied various settings, without any result. Any idea ? Is there a possibility to disable or to override courtesy tones elsewhere than in rpt.conf ? f/ex, in extensions.conf ? 73 de TKBI My settings in rpt.conf : unlinkedct = ct1 remotect = ct3 linkunkeyct = ct8 nolocallinkct = 0 nounkeyct = 0 holdofftelem = 0 telemdefault = 1 telemdynamic = 0