CME_RTR#sh voice register pool telephone-number 2030             ← find pool/dn from number
Pool ID              IP Address      Ln DN  Number               State
==== =============== =============== == === ==================== ============
1    A0E0.AFDC.51D3  192.168.1.229   1  1   2030$                REGISTERED  
CME_RTR#sh voice register dn 1                                   ← confirm settings
Dn Tag 1
Config:
  Number is 2030
  Preference is 0
  Huntstop is disabled
  Name John Thomas
  Allow watch is enabled
  Auto answer is disabled
  Label is John Thomas
  MWI registration is enabled
  call-forward b2bua busy 2555
  call-forward b2bua noan 2555 timeout 12
  Pool 1    has this DN configured for line 1
CME_RTR#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
CME_RTR(config)#voice register dn 1                              ← refer to dn-tag
CME_RTR(config-register-dn)#name Magic Mike                      ← caller ID
CME_RTR(config-register-dn)#label Magic Mike                     ← text display
CME_RTR(config-register-dn)#exit
CME_RTR(config)#voice register global
CME_RTR(config-register-global)#create profile                   ← send to tftp
%Error deleting flash:/its/jabber-config.xml (No such file or directory)
CME_RTR(config-register-global)#voice register pool 1              (or global for all)
CME_RTR(config-register-pool)#reset                              ← reset phone / all
CME_RTR(config-register-pool)#exit
CME_RTR(config)#exit
CME_RTR#copy run start                                           ← save config
Destination filename [startup-config]? 
Building configuration...

Compressed configuration from 49927 bytes to 13649 bytes[OK]
PBX_RTR#

Источник https://pbxbook.com/cisco/cmename.html