On Mon, Sep 12, 2011 at 6:02 PM, hadi motamedi <motamedi24 at gmail.com> wrote: > Thank you very much for your help. I got the point. So it is fax over > ip provider-specific but not centos-specific. Sorry for my mistake . I > thought that it is like sip phone client issue as I didn't find > anything specific from 'yum search fax' . I seriously think you should use google more often.