Softphone signals busy although it isn ́t

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I have written an click2dial application that rings an agent soft phone and connects the agent with a customer. very often I can see, that the agent softphones signal a busy back to server, although the phone is definitely hung up and the previous calls where handled normally. I testet 3cx Version 6 and X-Lite V1 up to V3… all show the same misbehaviour. I did a SIP Trace and can see, the phone replies with a busy on the invite… but I don´t know why. Has anybody experienced similar things and knows a reason or a workaround for this?
I am working on a asterisk 11.7 using sip-realtime peers with mysql.

thanks for reading, yves

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