[SR-Users] Missing ACK

Hello, See transmission below. For some reason the ACK package is lost/dropped and the remote server retransmits the 200 OK status. But Kamailio does not retransmit the ACK on receiving the retransmitted OK's. Eventually the remote server gives up and pulls the plug after ~20 seconds. Is this a bug or should I look closer at my routing script? The script is for the ACK handling pretty much the same at the vanilla script delivered with the source. I'm still on version 3.0.0. /Ole -> Request: INVITE sip:phonenum@destination, with session description <- Status: 100 Trying <- Status: 180 Ringing <- Status: 183 Session Progress, with session description <- Status: 200 OK, with session description -> Request: ACK sip:phonenum@destination <- Status: 200 OK, with session description <- Status: 200 OK, with session description <- Status: 200 OK, with session description <- Status: 200 OK, with session description <- Status: 200 OK, with session description <- Status: 200 OK, with session description -> Request: BYE sip:phonenum@destination -> Request: BYE sip:phonenum@destination <- Status: 481 Call leg/transaction does not exist