hangup on p910

Hello,

I've got a problem when i hang up a call on p910 (works fine on 6600).
here is the runL :
   RCall::TCallInfo aInfo;
   iCall.GetInfo(aInfo);

   if (RCall::EStatusConnected != aInfo.iStatus)
   {
                   // let's make my work
                   return;
   }

   // Let's go for a turn
   iLine.NotifyStatusChange(iStatus, iCallStatus);
   SetActive();

The problem is that i got a button to hangup which call the fonction :
void CMyClass::hangUp()
{
   RCall::TCallInfo aInfo;
   iCall.GetInfo(aInfo);

   if (RCall::EStatusConnected == aInfo.iStatus)
   {
      RCall iCall2;
      RLine::TLineInfo lineInfo;
      iLine.GetInfo(lineInfo);
      if (KErrNone == iCall2.OpenExistingCall(iLine, lineInfo.iNameOfLastCallAdded))
      {
         iCall2.HangUp();
      }
   }
}

On 6600, as i said, it works fine, but on p910, the HangUp() stays blocked.
I tried to call HangUp(status), which must be asynchronous, but it blocks too,

If anybody has an idea...
Thank you.