Send busy tone when blocking a call instead of hanging up

[Nick1024-cw]

I was wondering if it would be possible instead of hanging up after 2 seconds when a call is blocked, to have an alternative option where a busy tone would be sent to the caller indicating that the line is busy. I don't know how telephony works and I am not sure if this can be done at all.

[pamapa]

Are you using analog phone or sip phone?

For SIP phone:
Its possible to return a busy state. In side src/SipAccount.cpp function SipAccount::onIncomingCall

For analog phone:
I did not find an AT command to achieve that. Maybe someone else does? The related code is in side src/AnalogPhone.cpp function AnalogPhone::run

[Nick1024-cw]

Thank you for your reply. I am using an analog phone. Basically, I am trying to find a way to block the call without picking up the phone at all. I found https://stackoverflow.com/questions/42913125/block-incoming-call-hang-up-using-modem and it seems that maybe it is possible to disconnect the call without picking it up.

[pamapa]

Would be nice if you can try this out....