Centralized Contact List for all the extentions

Can we have a centralized contact list where all of our contacts can be accessed by different extensions. What we have now is if I'll add a contact my team mates can't see it. They have to ask me for the details and in the event that I am out of office it'll be hard for them to reach that contact without me. If only, we have the option to see all the contacts all across extensions that'll be great!