IP Phones go down and reboot

Unanswered Question
Aug 3rd, 2012

                   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,

I have this problem too.
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yasaman64 Fri, 08/03/2012 - 12:36

Can you tell me how can I troubleshoot that? this network is so vague to me and I dont know much abou tphone systems..

leonardotadeu Fri, 08/03/2012 - 12:51

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

yasaman64 Fri, 08/03/2012 - 12:55

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.

??

leonardotadeu Fri, 08/03/2012 - 13:03

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.

yasaman64 Fri, 08/03/2012 - 13:11

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

leonardotadeu Fri, 08/03/2012 - 13:18

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 
yasaman64 Fri, 08/03/2012 - 13:24

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?

yasaman64 Fri, 08/03/2012 - 13:26

It seems like my dns IP is not even operational. and where can I find my TFTP server?

sorry for all the questions

leonardotadeu Fri, 08/03/2012 - 13:41

can you post your dhcp config?

you can use the command sh ephone registered to see your ip phones registered.

yasaman64 Fri, 08/03/2012 - 13:46

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?

leonardotadeu Fri, 08/03/2012 - 13:49

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

yasaman64 Mon, 08/06/2012 - 06:04

Thank you so much fro your help :eonard,

here is the loggin file

yasaman64 Mon, 08/06/2012 - 06:10

Leonard, Can you take a lood at this line? could it be the issue?

.

004444: Aug  6 08:29:54.183: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/1/7 (not half duplex), with SEP0021A0858473 Port 1 (half duplex).

004445: Aug  6 08:30:54.185: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/1/7 (not half duplex), with SEP0021A0858473 Port 1 (half duplex).

.

004444: Aug  6 08:29:54.183: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/1/7 (not half duplex), with SEP0021A0858473 Port 1 (half duplex).

004445: Aug  6 08:30:54.185: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/1/7 (not half duplex), with SEP0021A0858473 Port 1 (half duplex).

leonardotadeu Mon, 08/06/2012 - 06:18

This message indicates a duplex mismatch on one side of the connection:

By default, Cisco switch ports and interfaces are set to Auto-negotiate

You must match the speed and duplex settings on both sides by setting both sides to Auto-negotiate or by hardcoding.

Read this doc

http://www.cisco.com/en/US/customer/products/hw/switches/ps708/products_tech_note09186a008015bfd6.shtml

Try to contact an network enginner to help you solve this issue.

yasaman64 Mon, 08/06/2012 - 06:26

Can I just set 0/1/7 to auto? I dont know how to access the other one and even what is that..??

leonardotadeu Mon, 08/06/2012 - 11:46

i think is better you contact an network engineer to help you solve this issue.

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Posted August 3, 2012 at 5:52 AM
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