I have a softphone, iSoftPhone, I am trying out, but when registered to FreeSwitch, it behaves strangely. That is probably the softphone's fault, but I thought I would report it here, so I could provide the developer of this phone with some more intelligent response. I have iSoftPhone on the same subnet as FreeSwitch, and it is registered ok. I then call from iSoftPhone to another registered phone on the same subnet, and answers. The SIP messages are here: http://pastebin.freeswitch.org/4688 The call are up, and I have nromal audio. I see that iSoftPhone is sending regularly the message SIP/2.0 486 Busy Here to FreeSwitch. I have reported this to the developer, but never got any response back. After 1 minute, FreeSwitch sends a new INVITE sip:imyrvold@192.168.207.101:5060 SIP/2.0 to iSoftPhone, maybe because of the "486 Busy Here" message? I lose audio now, and I have to hangup the call. Can anyone comment on the above behaviour? Ivan