Following information about asterisk username and password
* Asterisk server IP is the IP of the server where you are running asterisk (for e.g. 192.168.52.57)
* Asterisk server port is the port on which vtiger should connect to asterisk (default is 5038)
* Asterisk username is the name of the user who has his entry in the manager.conf file
* Asterisk Password is the password of the asterisk user.
* Asterisk Version is the version of asterisk you are using (right now 1.4 and 1.6 are supported)
Lots of people use Asterisk without telephony cards. You should read and understand the online document I referenced (or go on a course, or hire a consultant).
If you need interface cards, you can buy them from store.digium.com/products.php?category_id=20 It is likely that there are local resellers in your country. There are some competing products, but Digium provide free support to people using their genuine products on Asterisk.
5038 is the default AMI port, but you can change it. The AMI username and password are your choice. The IP address is your choice (I can’t imagine it being otherwise!).
The Asterisk version is your choice, although you should note that Digium no longer support either 1.4 or 1.6, so you should not use the service you reference unless they are prepared to provide all necessary support. The current versions are 1.8.x and 10.x asterisk.org/downloads