Use this patch:

Patch VKP;C702 SW-R3EF001
;Remove voicerecoreder beep
;(С)SiNgle
;(p) S3RIOS
;pAtChFiLe=/boot/phone_app.cxc
+FFFF000
1C7A5F4: 14 00
1C7A5D0: 1E 00