Hello,
Thank you everyone one more time for the previous suggestion in regards crossover cable.

My new problem is Cisco and Comdial are trying to negoiate ISDN. The first level of negotiation is completed. However, the second is fail. If I am turning on debug on Cisco it shows that a bad frame is coming from Comdial.
I have two questions: If anybody knows what is it?
The second question: If there is way to turn on any kind of debug on comdial to see ISDN negotiation, similiar what I can see on Cisco Router...

Thank you
Egor