One good effect from the change in isdn driver: telephony sounds a lot better. This is probably because zaptel automatically enables echo cancelling:Sep 11 20:34:38 greenblatt kernel: [ 2954.439478] Zapata Telephony Interface Registered on major 196 Sep 11 20:34:38 greenblatt kernel: [ 2954.439483] Zaptel Version: 1.4.10 Sep 11 20:34:38 greenblatt kernel: [ 2954.439484] Zaptel Echo Canceller: MG2