There are a couple of bugs in asl3-pi-appliance that may have caused your issue. These are fixed an in beta testing right now. I expect to release that here later tonight or tomorrow. In the interim, please run the following commands in this order to see if it resolves your issue:
sudo dpkg --configure -a
sudo apt install --reinstall dahdi-dkms
sudo modprobe dahdi
sudo modprobe dahdi_transcode
sudo modprobe dahdi_dummy
sudo systemctl restart asterisk