Cisco Fax Config, Loopback on 1 FXO port

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I have 4 FXO Voice Port. I will use the last two FXO to test a loopback for our fax.
here's the scenario:

FAX MACHINE------> PSTN -------> 1/1/1 FXO ROUTER 1/1/0 ------> PSTN --------> FAX

This are the nos. i used.
7473460 -------> PSTN -------> 7473457 ROUTER 7473451-------> PSTN --------> 6871331

MY ROUTER: 2621 IOS 12.2(2)XB

Problem:
1. What are the configuration in my 1/1/1 and 1/1/0 FXO Port.
2. Configs for Dial-Peers