UCCX 7 Call gets dropped once agent picks up

I have been troubleshooting a problem for a few weeks now where calls are being dropped as soon as the agent picks up the call. This is happening to various agents happening a few times per day everyday. I have done a reactive debug on the script and it seems to go through to the end ok yet everytime an agent reports a call drop as soon as they pickup, i see the following in the MIVR logs. I have checked the CSS/Partitions of all the CTI ports also.The CCM traces and Q931 traces show normal call clearing:
215269973: Apr 21 14:53:42.306 GMT %MIVR-APP_MGR-7-STEP_FAILURE:Failure to execute a step: Application=App[name=switchboard,type=Cisco Script Application,id=50,desc=switchboard,enabled=true,max=10,valid=true,cfg=[ApplicationConfig[schema=ApplicationConfig,time=Wed Jan 06 16:44:49 GMT 2010,recordId=67,desc=switchboard,name=switchboard,type=Cisco Script Application,id=50,enabled=true,sessions=10,script=SCRIPT[Switchboard.aef],defaultScript=,vars=null,defaultVars=null]]],Task id=30000147369,Step id=198,Step Class=com.cisco.wf.steps.ivr.TerminateStep,Step Description=Terminate (--Triggering Contact--),Exception=com.cisco.contact.ContactInactiveException: Contact id: 32425, Contact is inactive when getting channel
215373932: Apr 21 15:03:50.012 GMT %MIVR-LIB_EVENT-3-DISPATCH_FAILURE:A failure occured while dispatching an event: Event=com.cisco.call.CallEvent[CALL_ANSWERED,state=CALL_ANSWERED,contactImplId=3672150/2,lastContactImplId=3672150/2,session=Session[id=001-0x55ae8a4c1,parent=null,active=true,state=SESSION_IN_USE,time=1271858629996],lastSession=Session[id=001-0x55ae8a4c1,parent=null,active=true,state=SESSION_IN_USE,time=1271858629996],contactSeqNum=0,lastContactSeqNum=0] on CallContact[id=32462,type=Cisco Agent Call,implId=3672150/2,active=true,state=CALL_ANSWERED,inbound=false,handled=false,locale=en_US,aborting=false,app=null,task=null,session=Session[id=001-0x55ae8a4c1,parent=null,active=true,state=SESSION_IN_USE,time=1271858629996],seqNum=0,time=1271858629996,cn=null,dn=null,cgn=6664,ani=null,dnis=null,clid=null,atype=UNKNOWN,lrd=null,ocn=null,odn=null,uui=null,aniii=null,ced=null] at Wed Apr 21 15:03:50 BST 2010,Event source=CallContact[id=32462,type=Cisco Agent Call,implId=3672150/2,active=true,state=CALL_ANSWERED,inbound=false,handled=false,locale=en_US,aborting=false,app=null,task=null,session=Session[id=001-0x55ae8a4c1,parent=null,active=true,state=SESSION_IN_USE,time=1271858629996],seqNum=0,time=1271858629996,cn=null,dn=null,cgn=6664,ani=null,dnis=null,clid=null,atype=UNKNOWN,lrd=null,ocn=null,odn=null,uui=null,aniii=null,ced=null],Event listener=com.cisco.wf.subsystems.rmcm.ICDContactAdapter@50add0,Exception=java.lang.ClassCastException: java.lang.Integer
215375195: Apr 21 15:03:55.715 GMT %MIVR-APP_MGR-7-STEP_FAILURE:Failure to execute a step: Application=App[name=switchboard,type=Cisco Script Application,id=50,desc=switchboard,enabled=true,max=10,valid=true,cfg=[ApplicationConfig[schema=ApplicationConfig,time=Wed Jan 06 16:44:49 GMT 2010,recordId=67,desc=switchboard,name=switchboard,type=Cisco Script Application,id=50,enabled=true,sessions=10,script=SCRIPT[Switchboard.aef],defaultScript=,vars=null,defaultVars=null]]],Task id=30000147532,Step id=208,Step Class=com.cisco.wf.steps.ivr.OutputStep,Step Description=Play Prompt (--Triggering Contact--, WelcomePrompt),Exception=com.cisco.contact.ContactInactiveException: Contact id: 32461, Channel id: 52, Contact is in Terminated/Connected state
I do not have experience with scripting so if anyone could point me in the right direction that would be appreciated,cheers.

Reviewing the MIVR logs you provide I'm not sure which call your talking about. I see 2 calls with exception messages in the time stamp your saying.
First call:
Apr 22 11:49:11.621 GMT %MIVR-SS_TEL-7-UNK:CallID:33466 MediaId:3673987/2 Task:30000153869 com.cisco.jtapi.CiscoRTPInputStoppedEvImpl received
However this call is dropped as per the Jtapi message that the disconnect came from the CCM side however I can see that this call was never assigned to an agent so there should be no miss calls.
As for the second call, I don't have the full picture, as we don't have the offered message of when the call arrives to the system.
Here is a break down of the other call.
Call transferring to assigned agent:
Apr 22 11:49:07.308 GMT %MIVR-SS_RM-7-UNK:RIMgrAddressCallObserver: CallCtlConnInitiatedEv received for call 37228421 [3673989/2] and agent AylwardM
System changed call/agent states to answered/talking
Apr 22 11:49:07.308 GMT %MIVR-SS_CM-7-UNK:AgentCallContact 33468 and implId 3673989/2 moved to Answered state
We now see the exception message:
Apr 22 11:49:07.308 GMT %MIVR-LIB_EVENT-3-DISPATCH_FAILURE:A failure occured while dispatching an event: Event=com.cisco.call.CallEvent
However if you look futher down the call is connected to the agent successfully and in a talking state.
221901300: Apr 22 11:49:15.387 GMT %MIVR-SS_RM-7-UNK:RIMgrAddressCallObserver.callChangedEvent():
CallCtlConnEstablishedEv 3673989/2
Unknown event3673989/2
221901301: Apr 22 11:49:15.387 GMT %MIVR-SS_RM-7-UNK:RIMgrAddressCallObserver: CallCtlConnEstablishedEv received for call:37228421 [3673989/2], address 6656, calling party 6656, and called party 01923821368
Call Dropped as it recieve a disconnect event.
221902844: Apr 22 11:49:24.621 GMT %MIVR-SS_RM-7-UNK:RIMgrAddressCallObserver: TermConnDroppedEv received for call 37228421 [3673989/2] and agent AylwardM
The problem with the above call is that you don't see the CallCtlConnEstablishedEv till 7 seconds later, which is why I suspect you get the exception error, as it never got confirmation the call was delivered.
So my concern here, is if you stated you had a issue with calls getting dropped on the UCCX I would agree and ask you to provide CCM/Jtapi logs from the UCCX.
However you stated that your agents are getting miss calls on their IP phone, I disagree with this point as per the analysis performed.
"One question, when the CTI port is ringing the agent's phone to then transfer (reserved state) that call to that agent and the caller hangs up before the agent answer it, does the agent will hear a fast busy tone because that is what the CTI port transfer at the end to the agent? Am I right? if this is it I think there is no way to control this from the UCCX perspective, right?
Gabriel"
This senario will never happen, as the call would be terminated the moment the other party drops.

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