IP Phones go down and reboot

[yasaman64]

                   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,

[yasaman64]

Thank you so much fro your help :eonard,

here is the loggin file

[Leonardo Santana]

Yasaman try to contact an network enginner like Paolo said.

[yasaman64]

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).

[Leonardo Santana]

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]

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

[Leonardo Santana]

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