Is it ok if I vote to migrate asterisk questions from Super User to here?
Probably, since Asterix is extremely sysadmin-y -- are there any questions about Asterix that are actually end-user type things?
Also, how many are we talking?
Definitely, just like Exchange, SQL Server, Oracle, DNS servers, etc., etc. These are very much admin things.
I think when its admin related (e.g. how do I set up Asterisk, how do I configure it to talk to...) then clearly it belongs here. If it's end user related (e.g. what kewl things can I do with this phone plugged into a Asterisk VoIP system) then maybe SU isn't the right place for it but neither is SF.
This question looks off-topic for serverfault. If you look at the text, the person specifically mentions that he doesn't really want a sysadmin response. It possibly should have just been closed.
I was going to try to vote to return that particular question, but I seem to be experiencing a bug. https://meta.stackexchange.com/questions/74173/unable-to-select-vote-to-close
Serverfault isn't as busy as other sites. I am somewhat surprised that you only waited only an hour or two after asking this question, before you actually performed the migrate. It sure seems like you could have been a bit more patient.