I'm trying to add a phone extension to an acquaintance's work phone number that will autodial with a few seconds of a pause. I see that this is possible if I add this person to my speed dial list (using the Advanced tab...Extra Digits), but this is just an acquaintance. I don't really want to add him to my speed dial. Is it possible to add a phone extension in the "Work tel" field in the Contacts application with, say, a 2-second pause? I've tried the following formats:

(999)999-9999pp1234
(999)999-9999,,1234

but the phone fields only seems to accept digits, the hyphen mark, and parentheses.

Thanks for any help you can give me.