Pause(wait) codes in phone number

I have tried send a fax using a phone number with the "w" to cause a pause, but it does not appear to work.  I have tried the suggested "fax@xxxx" format in the "To" block, but that only causes the dialing box to show the "fax@xxxx" in the name box with the phone number box blank.  What's the secret?
daleehAsked:
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slang9Commented:
I have found that commas work well for pauses.
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