Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve jwcn-eurasipjournals.springeropen.com/counter/pdf/10.1155/2009/243956.pdf, which is not a DOI.
jwcn-eurasipjournals.springeropen.com/counter/pdf/10.1155/2009/243956.pdf may be a Handle (DOIs are a special sort of Handle). If jwcn-eurasipjournals.springeropen.com/counter/pdf/10.1155/2009/243956.pdf is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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