i'm working now on the 2.20 question, regarding MGCP t1 CAS, i did the configuration as the solution says adding the controller t1 cas config but when triyng to access the serial interface i can see it is not created automatically as is supposed to be done, maybe i'm doing something wrong here? can somebody explain me please?
here the commands:
controller T1 0/0/0
cablelength short 133
ds0-group 0 timeslots 1-3 type e&m-wink-start
description == Voice Circuit to PSTN
HQ-R1(config)#int serial 0/0/0:23
% Invalid input detected at '^' marker.