asterisk users - May 2013 - Unable to create channel of type 'SIP' (cause 20 - Subscriber absent)

Hi,

I'm using Cicso - Linksys SPA3102 to connect to asterisk. I have followed
the official user manual and the blog post here
http://www.skelleton.net/2012/08/02/linksys-spa-3102/

When I call an extension say 225 from the analog phone, I can get the IVR I
have setup in my dialplan. But when I Call the analog phone extension using
a sip phone I get the following error message:

Unable to create channel of type 'SIP' (cause 20 - Subscriber absent)

If any more information is required, i'd be glad to post it here.

Thanks
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