some VO notifies the applicants but in our case, we received SA and was able to track our application through e-cas using the UCI number few weeks after SA. at the moment, The CIC website was updated in March 17, 2015. Assessment of Sponsor is
Working on applications received on January 19, 2015. you can keep track on the progress on when theyll be working on March Applicants.
there's no need for you to call them unless you have inquiries that cant be found on their website or if there are changes with your address, number, etc.
The waiting part is really long, Welcome to the Waiting Game!
Goodluck on your application too.. i Hope my reply is useful enough.
Cheers!