research at businesstz.com wrote: > Hi Matthew > > You were 100% correct on the 56k. I have disabled it and change the > isup=16 to mtp2=16 and that solved my problem. > > Question: is there a way of explicitly tells dahdi that it should use ISUP!? > > Otherwise thank you for your advice The configuration in /etc/dahdi/system.conf only configures layers up to MTP1/MTP2. You set the ss7 signalling protocol selection (ISUP) in /etc/asterisk/chan_dahdi.conf Matthew Fredrickson Digium, Inc.