I recently purschased an Online number but the caller id does not work for incoming calls.How do we resolve this problem?.
You didn't mention what country your Online Number is in. Not all of Skype's Online Numbers are eligible for use as Caller ID when calling telephones or sending SMS messages. If your number is from one of these countries (Chile, Denmark, Estonia, Hong Kong, Poland, Sweden, the UK and the US), then it can be used this way. Otherwise, you can use a mobile number from countries other than Japan or Mexico as Caller ID with Skype, after the number goes through a verification process where Skype sends SMS messages with codes to that number.
To get to these settings, log into your Skype account here on the Skype web site using the "Account" link at the top of this page. You'll see a screen that would include your current Caller ID settings, and a link to change that. If your Online Number is from one of those countries I referenced above, just select it and you're done.
Hope that helps!