I tried to increase log level of sip and hw applications on the phone. Here is the result.
I think that it is the normal closing of the TCP connection after expiration. Do you agree?
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|New Connection Accepted
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|hw |2|00|rtosLinuxTask: tTCPListen188924 - stack start 0x43029000 size 0x10000
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|Task name tTCPListen188924
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|MsgSipTcpAccept
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|socket accepted 25615064
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|Waiting for a New Connection 0x43067cb8 0x43067dc0
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|Creating recv Thread
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|Waiting on recv Thread
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|MsgSipTcpPacket
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|CStkDialog::IsThisDialog 'NOTIFY' contact '<sip:~~rl~C~10...@y.y.y.y:5140;x-sipX-nonat>' != '<sip:~~rl~C~10...@y.y.y.y:5140>' caused a Dialog Target Refresh
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|CStkDialog::CreateRouteSet m_TargetAddress updated from '<sip:~~rl~C~10...@y.y.y.y:5140>' to '<sip:~~rl~C~10...@y.y.y.y:5140;x-sipX-nonat>'
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|CStkDialog::CreateRouteSet: existing routeSet preserved
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|CStkDialog::CreateRouteSet: transport set to top route 'TCP'
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |2|00|active dialog after UPDATE being set here, m_pActiveDialog=0x15fde64,this=0x15fde64
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |2|00|CCallBase::IsChallenged 'NOTIFY' Dialog Tag 'A8D52169-C175415E' pRequest Tag 'A8D52169-C175415E' state 'Confirmed'
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |2|00|new UA Server Non-INVITE trans state 'callingTrying', timeout=0 (0x40edff48)
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|CCallNoCall::calculateNewExpire new expires = 5812
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|UA Server Non-INVITE NOTIFY trans state 'callingTrying'->'completed' by 200 resp 65 timeout(0x40edff48)
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|doDnsListLookup(tcp): doDnsSrvLookupForARecordList for 'y.y.y.y' port 43140 returned 1 results
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|doDnsListLookup(tcp): result 0 'y.y.y.y' port 43140 isInBound 0
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|doDnsListLookup(tcp): doDnsSrvLookupForARecordList for 'y.y.y.y' port 0 returned 1 results
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|doDnsListLookup(tcp): result 0 'y.y.y.y' port 0 isInBound 0
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|CTrans:: SendCommand | this=0x40edff48, bVQMonMessage=0, m_pCall->m_pUser->m_bOBFailOverReRegOn=0, m_pCall->m_pUser->m_bVQMonFailoverEnabled=1
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|Send: (TCP) entry for address y.y.y.y port 43140 can Connect 0 canFailOver 1
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|Send: (TCP) address y.y.y.y port 43140 can Connect 0
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|CPlcmSipTcpSocket::Send TCP queuedTxData = 0 TotalLen 529 loop count 1 maxQueueDepth 40000
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |2|00|CTrans::InitRetrans for UA Server Non-INVITE NOTIFY state 'completed' Server 2 of 2 (0x40edff48)
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |1|00|CStkDialog::SetDialogState: Dialog ';' State 'Trying'->'Terminated'
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |2|00|CCallNoCall::Notified full dialog-info 1 of 1 version rx 8369 local -1
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|CCallNoCall::NewDialogList: bIsBLF = 'true', nTotalDialog = '1', justRefresh = 'false', removeFromList = 'false'
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |2|00|New FULL DialogList for '
sip:10...@mydomain.it' state 'BLF' size 1
May 26 16:34:27 10.102.141.16 64167fcfca5e|0526163427|sip |3|00|Waiting on recv Thread
May 26 16:34:32 10.102.141.16 64167fcfca5e|0526163432|copy |4|00|Could not set the custom header Content-Range for HTTP/s request. Head request failed to get content-length of server file.
May 26 16:34:37 10.102.141.16 64167fcfca5e|0526163437|log |4|00|UtilLogServerC::uploadFifoLog: upload error. protocol 0 result = 14
May 26 16:34:37 10.102.141.16 64167fcfca5e|0526163437|log |4|00|UtilLogServerC::uploadFifoLog: upload error. protocol 0 result = -1
May 26 16:34:59 10.102.141.16 64167fcfca5e|0526163459|sip |1|00|CStkDialog::TimeOut500ms: Server State txn finished NOTIFY (0x15fde64)
May 26 16:36:26 10.102.141.16 64167fcfca5e|0526163626|sip |1|00|Plcm: socket 188(0x4276b6a8) time expires
May 26 16:36:26 10.102.141.16 64167fcfca5e|0526163626|sip |3|00|CPlcmSipTcpSocket::~CPlcmSipTcpSocket socket 188(0x4276b6a8) close
May 26 16:36:26 10.102.141.16 64167fcfca5e|0526163626|sip |1|00|socket recv error error=0
May 26 16:36:26 10.102.141.16 64167fcfca5e|0526163626|sip |1|00|ListenThread socket 0 thread exiting
May 26 16:36:26 10.102.141.16 64167fcfca5e|0526163626|hw |5|00|Task ended without calling rtosTaskEnd() name=tTCPListen188924
May 26 16:36:26 10.102.141.16 64167fcfca5e|0526163626|sip |3|00|~CSipStreamSocket : socket 0 entry for 0x4276b6a8
May 26 16:36:26 10.102.141.16 64167fcfca5e|0526163626|sip |1|00|MsgSipTcpSocketStatus socket 0 status 0 m_bIsReconnectNeeded 0