I’ve summed audio output of SIM800C and FSK caller-id generator output to give line circuit of FCT.
When incoming call is received SIM800C gives music until call answered (ATA command) and this cause caller-id signal not to be detected by telephone. If I disconnect music by hardware, caller-id message is well received.
Could someone help how to prevent SIM800C playing music while incoming ring.
If not too much, I’ve another issue: Which AT commands adjust inbound and outbound voice levels during conversation?
Thank you in anticipation.