08-03-2012 05:52 AM - edited 03-16-2019 12:31 PM
Hi everyone,
I am sooo new to this phone system thing but we are a small business and we hav Cisco IP phones. recently they keep having problems. sometime one of them shut downs and we have to remove the cable and plug it in back to make it come up and re-register, and sometimes some of them reboot them selves, and there was couple of times that all the phones got rebooted together and sometimes all of them go down and we have to restart the router for them to come up.
I go into every phone by typing their IP in the IE and when i go to status message i get this:
No DNS server IP
DNS unknown Host
No CTL installed
TFTP timed out
and somethings like this.
Can anyone help me with this?
Thanks,
08-03-2012 12:34 PM
Probably your network is unstable, so phones loose connection, and reboot.
08-03-2012 12:36 PM
Can you tell me how can I troubleshoot that? this network is so vague to me and I dont know much abou tphone systems..
08-03-2012 12:42 PM
Check your switch configurtion, DHCP Server Configuration, and use this doc too might help you:
http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a008009485a.shtml
Regards
Leonardo Santana
08-03-2012 12:44 PM
what should I check on them?
08-03-2012 12:51 PM
Take a look on the documentation.
Step 1 Check for inline/PoE power issues.
Step 2 Check IP addressing and DHCP.
Step 3 Check for IP network connectivity.
Step 4 Check for CM issues.
What solution you have? CME? CUCM?
Regards
Rate this if helps you
Leonardo Santana
08-03-2012 12:55 PM
Oh i told you I am new to all of these, I dont even know its CME or CUCM and i dont know what they are.
all I know is I get connected to a router named UC520 and from there i can get connected to CUE and I dont even know what they are exactly.
on my phone, the address of DHCP and TFTP server is that same IP as UC520 router.
??
08-03-2012 01:03 PM
First you have to unterstand the boot proccess of the ip phones:
https://supportforums.cisco.com/docs/DOC-21496
Ok check, when then unregister the ip phones lost the ip?
If you wanna to solve you have to understand the problem first, know the ip phone boot process.
Step 1 Check for inline/PoE power issues.
Step 2 Check IP addressing and DHCP.
Step 3 Check for IP network connectivity.
Step 4 Check for CM issues.
08-03-2012 01:11 PM
Ok Thanks, but two questions:
how can i figure out I am using CUCM or CME?
and what does that mean theat my phone's TFTP and DHCP server is pointing to UC520 router?
and what is the role of that router and of CUE and how can i find my DHCP and TFTP server?is it possible if they are the same router(UC520)
Thanks
08-03-2012 01:18 PM
CUCM/CME are another Cisco Solutiion.
What means is that one the TFTP is where the IP Phones requests the config file (extension, permission..), second your UC520 Router seems to be the DHCP Server of your network.
The UC520 is your IP PBX, you can validate using the command sh run on the UC520.
Try to find the dhcp pool configuration, follow an dhcp config example:
ip dhcp excluded-address 172.16.1.100 172.16.1.103
ip dhcp excluded-address 172.16.2.100 172.16.2.103
!
ip dhcp pool 0
network 172.16.0.0 /16
domain-name cisco.com
dns-server 172.16.1.102 172.16.2.102
netbios-name-server 172.16.1.103 172.16.2.103
08-03-2012 01:24 PM
Thank you so much for your help, I really appreciate it, it is getting more clear to me right now.
Yes I've found out the DHCP config on UC520. Now what is the next step in troubleshooting? what should I check about the DHCP and IP addresses?
08-03-2012 01:26 PM
It seems like my dns IP is not even operational. and where can I find my TFTP server?
sorry for all the questions
08-03-2012 01:41 PM
can you post your dhcp config?
you can use the command sh ephone registered to see your ip phones registered.
08-03-2012 01:46 PM
this is my DHCP config:
ip dhcp relay information trust-all
ip dhcp excluded-address 50.2.2.1 15.2.2.10
ip dhcp excluded-address 50.50.2.1 50.50.2.10
ip dhcp excluded-address 192.168.120.1 192.168.120.20
ip dhcp pool phone
network 50.2.2.0 255.255.255.0
default-router 50.2.2.1
option 150 ip 50.2.2.1
And how is that command gonna help me troubleshoot?
08-03-2012 01:49 PM
Your TFTP Address is 50.2.2.1.
When the IP Phones lost the register see if they lost the ip address, can you post the sh logging of your router.
Your are conected to an switch correct? They are using PoE?
Verify your interface that is using this IP 50.2.2.1, post he sh interfaces too.
Put the commands output on an notepad an attach to this discussion.
Regards
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