take a look to development guides for your cucm version. basically it is a development of a phone service

I think it is not possible to do that because the corporate directory provided with cucm reads the contents of a local database feed with ad data.In my opinion you should develop your own corporate directory which filter data taking into account the ...

hifirst try to identify which side must provide the clock.can you provide outputs fromshow controllers e1debug isdn q931 is not usefull here, instead you should enable debug isdn q921.coaxial cables connected to balun can be crossed , did you try to ...