Please follow these below mentioned steps to receive your calls on Gtalk.
i). Login to your account, Click on the “View all my numbers option” which is given under “My numbers option”.
ii). As you will click on “View all my numbers” option it will open a page where you can see the all available numbers in your account then click on the desired number through which you want to receive calls on Gtalk.
iii). As you will click on the desired number it open a window with many options, click on the “change forwarding” option just aligned with “current forwarding settings”.
iv) Click on it, It will open a new page from there please select the Gtalk from the different below given options. Please put your Gtalk ID under the “Change forwarding to” option then please click on submit.
v). To receive call from the user who is calling, you must add email@example.com in your contact list of GTalk.
Once you add this contact you will be able to receive call from your virtual number on your GTalk.
Video will show you how you can received calls on your Gtalk.