Using Asterisk to serve a PRI to a Lucent Portmaster Dial-in

Situation:
PRI coming into Asterisk box. We don’t need all the channels.
Another PRI coming into a Lucent PortMaster. We don’t need all the channels.

Question:
Can Asterisk make the unused channels available to the PortMaster if I add another PRI card to the * box? Does this design raise any alarm bells?

George