Hi Robiul,
Distinctiveringlist allows you to assign different ringtones to different DN's on a phone but it does not provide the option for ringing the same line differently for onnet or offnet calls. You may check the following links for more details
https://supportforums.cisco.com/discussion/11349646/distinctive-ringing-cucm-85
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8941_8945/10_0/english/admin_guide/P415_BK_AA30369C_00_adminguide-8941-8945-10_0/P415_BK_AA30369C_00_adminguide-8941-8945-10_0_chapter_01000.html
Manish
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