typedef struct tagExtParams
{
HANDLE ConnectEvent;
void (*ExtHandler)( sdkExtHandlerStatus *ExtHandlerStatus);
sdkDialParams DialParams;
UINT ConnectTimeOut;
}ExtParams;

код:

---

type 
  PSdkExtHandlerStatus = ^SdkExtHandlerStatus;
  TExtHandler = procedure (ExtHandlerStatus: PSdkExtHandlerStatus)
  TExtParams = record
    ConnectEvent: Integer;
    ExtHandler: TExtHandler;
    DialParams: SdkDialParams;
    ConnectionTimeOut: Cardinal;
  end;

Еще DialParams надо вставить перед ConnectionTimeOut.