I initially posted my issue on the official Asterisk Forum.
Joshua Colp (Asterisk Technical Lead) responded with the below:
There is an explicit option required to send silence when recording
https://github.com/asterisk/asterisk/blob/master/configs/samples/asterisk.conf.sample#L60
And when asked is there’s a difference between transmit_silence and transmit_silence_during_record? He said:
There is no difference, they are the same. If I recall correctly the option was expanded to cover sending silence during more scenarios so it became transmit_silence.
So I do think this should be the default and it will help other users, or at least it won’t cause any harm.
Thank you
