twister

I need to program a phone number into GS350 phonebook with an extension. I know that I get a choice of either putting "pause" or "wait" on the display, and tried both of those without any luck. I actually programmed the number into a speed dial from a phonebook, and it just dials the number but never goes pass "pause" or "wait" characters to enter the remaining extension numbers. Has anyone tried getting that to work?