Avalue EBM-PNV - Manual (Page 10)

EBM-PNV (B.2) Quick Installation Guide
10 EBM-PNV (B.2) Quick Installation Guide
2.3.7 Handset speaker Mode selector (JHS)
Signal PIN PIN Signal
HS_MIC+ 1 2 HS_MIC-
HS_OUT+ 3 4 GND
HOOK 5 6 GND
2.3.8 Battery connector (BAT)
Signal PIN
GND 2
BAT 1