Why does it take so long to connect a call when I dial an extension?

The phone doesn't know if you are dialing an external number or an internal number, so it is waiting for additional numbers. You can force it to dial immediately by:
  • VVX-411: press the Send softkey button
  • VVX-601: tap the green phone icon on the right side of the touchscreen
  • VVX-250/450: press the Dial softkey button