Well, it would be the easiest solution, indeed.
I have already tried it and it works OK.
But the problem is that I have quite big family
so there would be quite a lot of different inbound routes which will be IMHO not easy to maintain.
And even more important is the fact that I don't want to disturb regular workflow of CC business, customers shouldn't be bothered by any new IVR or confusing messages about extensions, etc.
That's why I look for a solution within a2b including CID recognition and based on regular CC business message "enter the number you wish to dial" the a2b should be able to recognize that i.e. 150 is not a regular number to dial but local extension .
Thanks a lot for help jrooper