A DTMFSequence object represents a sequence of Dual Tone Multi
Frequency signals.
The constructor methods for this class are:
- DTMFSequence()
- Constructs an empty DTMF sequence object. You can set the sequence later
using the setKeySequence() method.
- DTMFSequence(java.lang.String sequence)
- Constructs a DTMF sequence object with the specified sequence.
For example: 
public class InApp extends WVRApplication {
  // Create a DTMF sequence
  public DTMFSequence telNo = new DTMFSequence("815443");
  .
  .
  .
}