Getting a CallCentric  10 Digit SIP number is step 1

 yeah , you need to get to  and register for the free IP freedom which will eventually assign you a 10 digit SIP number , if you follow  all the steps

Now proceed with the couple of screens /steps and instuctions for SIP number to be generated , and make sure you get all aspects right . The name and passwords are are case sensitive and will need a email response / confirmation to complete .

Pictures will do much of the talking from here on.

Information continues on page 2 .. , get there by either clicking the right arrow( top right of this page)

Subsequently you may have to log in to make some tweaks , howver it is rarely needed.
or clicking on page 2 link itself