You can connect to XPR V7 to a HiPath 4000 V4 or V5 using CorNet-IP. I can't help much beyond the docs, as we've since moved on to OSV and XPR V8.
From the OpenScape Xpressions V7 Server Installation Guide, dated 11/2014:
Server 2003 (R2) and Server 2008 are recommended for new installations.
Connecting a HiPath 4000 V5.0 differs only in one point from connecting a HiPath
4000 V4.0 (see Section D.6, “Connecting HiPath 4000 V4.0 (CorNet-IP)”, on
page 454):
1. Start the XPR monitor.
2. Open the Modules of <XPR server name> window.
3. Doubleclick on CtiApl.
4. Doubleclick on Edit Settings.
5. Doubleclick the HiPath 4000 V5.0 entry.
6. Activate the ACSE (Association Control Service Element) checkbox.
7. Click on OK.
LoPath
Maintain HiPath 4000 V5 & V6, OpenScape Xpert V4 & V6, OpenScape Xpressions V7, OpenScape Contact Center V8, OpenScape Voice V9