How can you store "pauses" in speed dials for the GXP-2000? I used something like 8005551212,,,1,7890 to dial the toll free number, wait 6 seconds (I'm used to the commas being a 2 second delay), pressing 1, waiting 2 more seconds and then entering 7890. However, when I press the speeddial button, the phone freezes. Thanks, Waldo