Edit /etc/asterisk/chan_dahdi.conf and change following lines under channels context.
[channels] cidstart=ring immediate=yes faxdetect=no usecallerid=no ; If you are not using caller id facility.
Edit /etc/asterisk/chan_dahdi.conf and change following lines under channels context.
[channels] cidstart=ring immediate=yes faxdetect=no usecallerid=no ; If you are not using caller id facility.