Not to say that this is the case for you, but i had to give up my vitelity DID as it just stoped working properly one day and i had not changed anything and they claimed they hadnt changed anything.
But in reality someone changed something as my incoming calls would not make it in, and do as you describe, i went through a lot of trouble shooting with vitelity and nothing, i could only get it to work when directly registered
Luckily i was just testing out vitelity, and only had it 2 months, but i ended up moving to a new number on callcentric, which i have found to be amazingly better and much more flexable ie they have sip uri forwarding avaliable on thier account.
So good luck with vitelity, atleast you are still able to use it parcially, and sorry i could not be of any help her
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