You can discover it by yourself. Download a ring by browser, then look at actual phone's XML configuration (http://ip-phone-address/admin/spacfg.xml). If you will found the URL of downloaded ring tones here, then you discovered the appropriate tag at the same time. If no URL here, then it seems not to be possible to do via provisioning.
Learn, share, save
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.