I have to setup a server to route telephone calls coming to a particular landline no to cell phone phones depending upon the availability of user.
I want to know what technology call centres or telecom giants use for the same. While exploring some such options I came across following
1) http://www.addictivetips.com/ubuntu-linux-tips/yate-is-free-voip-client-for-linux-that-supports-gtalk/ 2) http://packages.ubuntu.com/dapper/meta-ul-pbx-server
Let me know if these are what will serve my purpose. Also let me know what hardware I might need along with setting up of such servers. What keywords should I exactly Google.We use Ubuntu servers in our environment.