What do you mean by "internal numbers"?
If I put a name and 9-digit Obitalk number in the 1032's phone book and call from that number over the Obitalk network, that name and number appear on the 1032's screen.
If I put a name against an Asterisk PBX extension number in the 1032's phone book and call from that number to the 1032's PBX number the 1032's screen shows the name sent by Asterisk, not the name in the 1032's phone book.