If you want to break out channels for each remote site, then you'll have to do it on a "channelized" controller. What this means is doing the channel breakout on the CSU/DSU. A channelized controller has a built-in CSU/DSU, or you have have an external CSU/DSU, but it would also require 30 serial interfaces on the router, one for each remote site.
You probably don't want to do this with PRI, unless you want to have the remote sites dial via ISDN.
What is very common in North America is to buy T1/E1 frame-relay service at the head office and then fractional T1/E1 at the remotes.
You could also do it by breaking out channels with a channelized controller, but you will need a channelized E1 controller on the router.
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