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cisco 8831 can not register

I have new 8831,  and i am using CME :Cisco IOS Software, C2951 Software (C2951-UNIVERSALK9-M), Version 15.4(1)T1, RELEASE SOFTWARE (fc2)


the 8831 can get ip and goes to voice vlan. I can ping the phone ip by CME, but the phone just keep showing Phone not registered. Dose anyone know how to fix it

voice service voip
 no ip address trusted authenticate
 no supplementary-service sip handle-replaces
 fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none
  registrar server

voice register pool-type  8831
 xml-config maxNumCalls 4
 xml-config busyTrigger 4
 xml-config custom sshAccess 0
 description CISCO IP phone 8831
 reference-pooltype 9971
voice register global
 mode  cme
 source-address port 5060
 max-dn 4
 max-pool 5
 load 8831 sip8831.9-3-3-5
 authenticate register
 authenticate realm
 create profile sync 0253815872624616
 conference hardware
voice register dn  1
 number 150
 name Boardroom A
voice register dn  2
 number 151
 name Boardroom B
voice register template  1
voice register pool  1
 busy-trigger-per-button 1
 id mac XXXXX
 type 8831
 number 1 dn 1
 template 1
 dtmf-relay rtp-nte sip-notify
 username 150 password cisco
 codec g711ulaw
voice register pool  2
 busy-trigger-per-button 1
 id mac XXXXXX
 type 8831
 number 1 dn 2
 template 1
 dtmf-relay sip-notify
 username 151 password cisco
 codec g711ulaw

The dn 1 is working fine, I am having issue with dn  2


Hall of Fame Master

Re: cisco 8831 can not register

So, you have one 8831 successfully registered but another is not registering?

Have you performed factory reset on the phone?

Re: cisco 8831 can not register

for the new one, i did .

Re: cisco 8831 can not register



It looks like there is some kind of issu with this phone so you should hardware reset it and try to register it again.


Upon connecting it back to network try to create-cnf files again on CME



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Re: cisco 8831 can not register

i am totally new to voip. would you mind get me some detail about create-cnf file?


I reset the phone already 

Re: cisco 8831 can not register

On your CME Router, enter


conf t


create cnf



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Re: cisco 8831 can not register

 create cnf-files version-stamp 7960 Feb 05 2019 13:06:03


I created it, and still does not work, do you need my all config?


Re: cisco 8831 can not register

Does the phone also receive the TFTP server info from DHCP or is it maybe hard coded on the second phone?

Do you see REGISTER messages coming from the phone to your CME?

Re: cisco 8831 can not register


 Pool Tag 2
  Mac address is AC44.F213.6D0B
  Type is 8831
  Number list 1 : DN 2
  Proxy Ip address is
  DTMF Relay is enabled, sip-notify
  Call Waiting is enabled
  DnD is disabled
  Video is disabled
  Camera is disabled
  Busy trigger per button value is 1
  keep-conference is enabled
  registration expires timer max is 3600 and min is 60
  username 151 password cisco
  template is 1
  kpml signal is enabled
  Lpcor Type is none

  Transport type is udp
  service-control mechanism is not supported
  Registration method: per line
  Privacy feature is not configured.
  Privacy button is disabled
  conference admin: no
  conference add mode: all
  conference drop mode: never
  Reason for unregistered state: 
         No registration request since last reboot/unregister

  paging-dn: config 0 [multicast]  effective 0 [multicast]

Dialpeers created:

  Active registrations  : 0

  Total SIP phones registered: 1
  Total Registration Statistics
    Registration requests  : 0
    Registration success   : 0
    Registration failed    : 0
    unRegister requests    : 0
    unRegister success     : 0
    unRegister failed      : 0
    Attempts to register 
           after last unregister : 0 
    Last register request time   : 
    Last unregister request time : 
    Register success time        : 
    Unregister success time      : 

no request to cme  


Re: cisco 8831 can not register

What about the TFTP on the phone? You could try to enter it as alternate TFTP if you have problems with your DHCP. Also, is this a used phone? Maybe it has an ITL installed which does not trust your CME and blocks registration (delete ITL file then).

As you're using SIP phones for creating profiles you'd need to enter:

voice register global

no create profile
create profile

VIP Collaborator

Re: cisco 8831 can not register

Hi there


Try removing the below commands and apply 'create profile' command on 'voice register global'


authenticate register
 authenticate realm



Hope this Helps

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Re: cisco 8831 can not register

I reboot the CME and the phone register successfully 

Thank you

Re: cisco 8831 can not register

TFTP is working fine because I have another 8831 is running, I reboot the CME and the phone register successfully .

Thank you

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