NEC1 could be correct; however, NECx1 or NECx2 are also possible. These are used in some Samsung equipment. DecodeIR.dll 2.42beta has support for these 32 bit NEC signals, although if used with IRTool, it doesn't show the second byte of the function number.   It decodes this as NECx2, device 8.240, function 26.

The difference is that the NEC1/NEC2 lead in is 0157 00AC , while NECx1/NECx2 has lead in 00AC 00AC.   So the learned signal is closer to NECx1 or NECx2, which is why DecodeIR.dll chooses NECx2.  The difference may be important for repeated signals.

Chosen1, if you are so inclined, please also try:

Vol Up--NECx1 Device Code: 8.240 (0x08.0xF0) Function: 31 (0x1F)
0000 006D 0022 0003 00AC 00AB 0015 0016 0015 0016 0015 0016 0015 0041 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0016 0015 0016 0015 0016 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0016 0015 0016 0015 0016 0015 0689 00AC 00AB 0015 0041 0015 0E3F

Vol Up--NECx2 Device Code: 8.240 (0x08.0xF0) Function: 31 (0x1F)
0000 006D 0000 0022 00AC 00AB 0015 0016 0015 0016 0015 0016 0015 0041 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0016 0015 0016 0015 0016 0015 0041 0015 0041 0015 0041 0015 0041 0015 0041 0015 0016 0015 0016 0015 0016 0015 0689

By the way, IRversion 8.03 gives a very full decode using DecodeIR v 2.42b if the hex is imported into the Learned Signals tab:
Protocol   Device Sub-device  OBC  .... Misc
NECx2-f16     8      240       26      8.F0.1A.1A

It shows the IRP form:
{38.6k,555,msb},1,-1|1,-3>(2609u,-4729u,A:32,1,-85.5m)+{A=$100F5858}; Alt Leadout form: ^141m