CONFIG_MACH_VOICEBLUE is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_VOICEBLUE.
Result is shown for kernelversion 6.5.1

Voiceblue

modulename: board-voiceblue.ko

configname: CONFIG_MACH_VOICEBLUE

Linux Kernel Configuration
└─>TI OMAP1 specific features
└─>Voiceblue
In linux kernel since version 2.6.12  
Support for Voiceblue GSM/VoIP gateway. Say Y here if you have
such a board.

source code: