Preferable would be to have at least V6 R1 H4k sys ver.
If connection with XPR is over Dialogic ISDN boards you might have connectivity issue.
Over SIP connectivity is ok.
Also, independent of connectivity type (SIP,ISDN), new features of OpenScape Xpressions V7 will not be supported.
I was running XPR V7 R1.5.18409 on my HiPath 4000 V5 (RMX V5 R1.6.38 / UW7 V5 R1.2.8). We use SIP connections. I'm not sure what "new features" aren't supported, but as a basic voicemail platform it works great.
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