My $0.02:

First off, Coral is right, Secondly, Installing a DCI module in a phone and setting up SMDR should take about 1 - 2 hours. Have it dump to a laptop using Procomm (or other emulator. then run a script to extract the CID. The device you stick on the trunks are rather spendy and you need one for each set of lines ( 4 or 8 I think the device comes in). TAPI would work well with your address software. Depending on the final application you have several ways to go. A call accounting program might be worth the investment.

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