verify the ringlist.xml file is on the TFTP server
you do not mention your version so i'm posting for 6.x (please always do so)
Custom Phone Rings
http://www.cisco.com/en/US/docs/voice_ip_comm/cucmbe/admin/6_0_1/ccmfeat/fsrings.html
if not your version, look ringlist.xml on cco for the doc from your version
HTH
java
if this helps, please rate
HTH
java
if this helps, please rate