this is a bug, which happens since version 3.x .... yes ... 3.x anyway, what happens is that TFTP cache some files into the memory, even restarting the TFTP service does not clean such cached files from RAM. maybe restarting the server (since that will  clean the memory and make the file get cached again). apparently TFTP cache some files to make it promptly available to phones, this is useful when  you have a massive firmware upgrade for example and you have several phones requesting the firmware (.bin files). if the file is cached the server does not need to read such files from disk but it does from the cached file on RAM memory instead, as we all know RAM is much faster than disks. what happens is that ringlist.xml is one of those files. my case i went from version 8.5 to 11.5, here is how i fixed. 1 - got all the files from 8.5 (ringlist.xml, DistinctiveRingList.xml and all files with the .raw extensions) 2 - uploaded all files manually to the new CUCM (version 11.5) by going to OS admin >> software upgrade > tftp file management >> upload. 3 - go back do CUCM admin, into service parameters >> Cisco TFTP >> advanced and change "Enable Caching of Constant and Bin Files at Startup " to FALSE 4 - restart TFTP 5 - Restart the phones. 6 - check if the issue is fixed 7 - go back to the service parameters and change " Enable Caching of Constant and Bin Files at Startup " back to TRUE. 8 - restart TFTP service again all done! =) original bug on 3.x http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-callmanager/23560-ring-type-23560.html ... View more

@ carlnewton You answer Should be marked as correct answer. After about a day troubleshooting with TAC i finally found this tread and bingo, i had the sip profile. changing the name as you advised made the trick. Migration: Be5K 8.6.1 >>> Import migration to CUCM VM 8.61 >>> refresh upgrade to 11.5 I was having the issue when upgrading to 11.5. i was sure that i made something wrong on the Import from BE5K, and that was causing the issue, but, the issue was like you described someone had the "Standard SIP Profile for Cisco VCS" configured in the CUCM before the upgrade. THANK YOU! ... View more

try using a 8.6 OVA, this error usually is due to the virtual Network interface that was added to the VM. new ova comes with VMXNET3 where older OVAs (like for 8.6) used flexible type. ... View more

4 years later i end up here and look who is around. lol ... View more

May you share the sho run interface s of the router? ... View more

yes, jaime is correct, also depends on the IOS version running on the H323 voice gateway. i was forced to dongrade a IOS version on a case where a fractional E1 was needed. Regards, ... View more