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Confirgure cisco 7821 phone on CME


Hello All,

I have bought Cisco 7821 phones and unable to get them registered with CME 7.1, and have found that the current IOS does not these phones.

Please find the show version output below and recommend a suitable IOS. A quick reply will be a great help.

Router model: 2921


Flash: 256MB

Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.0(1)M3, REL EASE SOFTWARE (fc2)
Technical Support:
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Sun 18-Jul-10 03:32 by prod_rel_team

ROM: System Bootstrap, Version 15.0(1r)M6, RELEASE SOFTWARE (fc1)

TST-WAN uptime is 6 weeks, 2 days, 7 hours, 25 minutes
System returned to ROM by power-on
System restarted at 07:17:35 AST Mon Dec 14 2015
System image file is "flash0:c2900-universalk9-mz.SPA.150-1.M3.bin"
Last reload type: Normal Reload

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
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to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

Cisco CISCO2921/K9 (revision 1.0) with 479232K/45056K bytes of memory.
Processor board ID FCZ1435722Z
3 Gigabit Ethernet interfaces
1 terminal line
12 Voice FXO interfaces
1 cisco Integrated Service Engine(s)
Cisco Unity Express 7.1.7 in slot 1
DRAM configuration is 64 bits wide with parity enabled.
255K bytes of non-volatile configuration memory.
254464K bytes of ATA System CompactFlash 0 (Read/Write)

License Info:

License UDI:

Device# PID SN
*0 CISCO2921/K9 FCZ1435722Z

Technology Package License Information for Module:'c2900'

Technology Technology-package Technology-package
Current Type Next reboot
ipbase ipbasek9 Permanent ipbasek9
security None None None
uc uck9 Permanent uck9
data None None None

Configuration register is 0x2102


Thank you

26 Replies 26

Can you try configuring exactly as the config I pasted in my previous comment earlier and then check.

Also if possible try connecting the 7821 phone to one of the port wherein you already have a working phone




existing phones are not registering (example: 7911, 7945), please help

So you are saying none of the phones are registering. Is that correct??

By any chance you have the show run before the IOS upgrade. If yes, then match with the current config to see if any command had gone missing. Did you try relaoding the router to see if that helps.



Hello Deepak/Rajan,

Finally I got my existing phones back up and running, and also the new 7821s.

Thank you so very much for your help and support. Appreciated!!!!!

will get in touch....

Have you uploaded the required FW 10.1(1)SR1 to the flash, Below is one of the working config for 7821 phones on CME 10.5

voice register pool-type  7821

voice register global
mode  cme
source-address port 5060
max-dn 300
max-pool 150
load 7821 sip78xx.10-1-1SR1-4
authenticate register
authenticate realm all
timezone 31
tftp-path flash:
create profile
voice register dn  1
number 4301
name Agent 1
label Agent 1

voice register pool  1
id mac 3C08.F67A.A61A
type 7821
number 1 dn 1
presence call-list
dtmf-relay rtp-nte
username 4301 password 123
description +85224051234
codec g711ulaw
no vad




IOS has been upgraded successfully but the existing phones are still not coming up,

please help!!!!

TST-WAN#sh telephony-service
CONFIG (Version=10.5)
Version 10.5
Max phoneload sccp version 17
Max dspfarm sccp version 18
Cisco Unified Communications Manager Express


You can go with IOS version 15.4.3M4 which is the current stable one.



Hello Rajan,

Kindly give me complete code for this IOS, so that I could download it.

And I hope this IOS version does not impact CUE and other running-configuration, right??



This IOS actually upgrades your CME version to 10.5. I dont think there will be any issues with your existing configuration as you are currently running 15.0.

Thank you Rajan!

I am going to upgrade it tonight, and will keep you posted.

Once again thank you


Always welcome :)

Hello Rajan/Deepak,

I have upgraded the IOS but none of the phones coming up, please help

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