Technical Guide

DU & LPA Technical Provider Selection Guide

Configuring your Loan Origination System (LOS) to communicate properly with Automated Underwriting Systems (AUS) is a critical step in establishing a frictionless pipeline.

Technical Configuration Breakdown

This guide provides the exact dropdown selections and provider codes required to map ISC Credit directly into your underwriting environments.

What's Inside:

  • Fannie Mae (DU): Step-by-step credit provider selection
  • Freddie Mac (LPA): Technical mapping and identifiers
  • Troubleshooting initial connection failures

What this guide explains

This guide walks through the exact provider selection steps for connecting ISC Credit to both Fannie Mae's Desktop Underwriter (DU) and Freddie Mac's Loan Product Advisor (LPA), including the specific technical identifiers and mapping required in each system. It also covers how to troubleshoot the most common connection issues that come up during initial setup.

Who this guide is for

System Administrators, LOS Managers, and IT professionals responsible for mapping credit vendor API connections within lender environments.

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