The only reason why I think the second call is connecting and then hanging up is because the second call has the exact same Call-ID as the first call. So when the OpenSIPSProxy sends the CANCEL for the first call to the OpenSIPSB2BUA the second call has already started connecting and sending the 183 to the OpenSIPSProxy. So the second call has just enough time to ring the remote phone as OpenSIPSProxy and OpenSIPSB2BUA are tearing down the initial call which has the exact same Call-ID. Doesn this make any sense?
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