I am newbie in Voice over IP.
I have cisco 2821 chassis (12.4 ios) in each office, and 2 PBX with PRI card. I nead to connect PBX in offices via IP network (use PRI card of PBX in each office). I nead medium quality.
I read many manuals, i think i nead this modules in each office router:
1 E1 port in stock.
It is enough? Or which modules i nead buy to cisco 2821?
Have someon working example configuration?
P.S. Sorry for bad English.