Thanks to everyone! Just correct me now:
AIRBUS
1) SELCAL is used for VHF
2) When the captain has selected VHF2 in RMP 1 or if the first officer has selected VHF1 in RMP 2, the SELCAL turns white. Just need to reset it. It will turn off and you can start it back.
3) When you are changing a frequency and you just got a SELCAL, the SELCAL turns white. When you go on the new frequency, the SELCAL turns off.
4)When you reset a SELCAL, it turns green.
5) When you received a SELCAL, to turn off SELCAL, you need to press SELCAL in this order: White (received SELCAL)-Green (Reset)- Black (off)
6) When you are changing a frequency and you just got a SELCAL, the SELCAL turns white. You reset it, it turns green.When you go on the new frequency, the SELCAL turns off.
Regards,
AF330