fedeli, We used to use 5.1.1 with VV Pro 5 when using the D/240SC-T1 cards on Windows 2003. When we upgraded to Windows 2012, we couldn't use those cards nor 5.1.1, so we tried the D/240JCT-T1 and D/480JCT-2T1 cards and "System Release 6.0 PCI Service Update 1 Service Update 271" and it worked. I don't think Dialogic added any particular feature - more like they kept things backwards compatible with older versions (hence allowing VV Pro 5 to continue working).
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