asterisk users - Feb 2009 - Does audio have to flow through vitelity servers ?

My asterisk box is in a datacenter in San Francisco CA.

The vitelity servers are 30 ms away from my asterisk server.

Lets consider the scenario that some one is calling from San Francisco
to the 800 number which I have with Vitelity.

My question is:
Does the audio first flow to the vitelity server and then to the
asterisk server in CA ?
Since if that was the case it would add a 60ms lag time to the conversation.

Thanks for helping me clear this up,

Vikas