GUI based.. or ??

Hi,
I am Abhishek from India.
I am have studying Cisco VOIP since a couple of months.Searching for Soft
PBX somenthing like (Cisco Callmanager) i came accros this Asterisk.
I have to provide a a solution to a clinet where he wants a connectivity
between his 3 offices across the WAN with a very limited amount of
budget.Since i am not aware abt this product  much, but was able to foind
out the features of the product and was satisfied also, So i just wanted to
know from u ppl (since u ppl are expert in this) that :
1.)does this product has got a GUI interface .??
2.)Can we integrate Cisco or any other H/w with this.?
3.)it looks like freeware..isnt it.?

Please do let me the details abt the same..

I ll be really greatful

Thanking You,

Regards

Abhishek Katta

----- Original Message ----- 
From: "Rich Adamson" <radamson <at> routers.com>
To: <asterisk-users <at> lists.digium.com>
Sent: Sunday, July 18, 2004 8:45 PM
Subject: Re: [Asterisk-Users] Echo problem update - POSSIBLE SOLUTION

> > So are saying that T2240 will gurantee no echo issues? Did you get any