Have a look at the security configurations settings on your Phone, try erasing the CTL files from phone.
or you can use another command under 'telephony service - *load-cfg-file* * file-url* *alias* *file-alias* [*sign*] [*create*] Usage Guidelines This command is used with Cisco Unified CME phone authentication to sign configuration files that are not created by Cisco Unified CME. This command also loads the signed and unsigned versions of the file on the TFTP server. To simply serve an already signed file on the TFTP server, use this command without the *sign* and *create* keywords. The *create* keyword should be used with the *sign* keyword the first time that this command is used for each file. The *create* keyword is not maintained in the running configuration; this prevents signed files from being recreated during every reload. Examples The following example creates a file called ringlist.xml.sgn in slot0 and serves both ringlist.xml and ringlist.xml.sgn on the TFTP server. telephony-service load-cfg-file slot0:Ringlist.xml alias Ringlist.xml sign create http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/command/reference/cme_l1ht.html#wp1061914
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