Cisco IP phone showing "Unknown " state

[kaleelkp984]

Remote location there is only one cisco 9951 IPphone,after changing gateway model is 2900 and its version is 15.2

phone is going to unregister mode ,our call manager showing "unknown" state

manual configuration ip phone setup

dhcp :disable"

we are check all the possibility of registration but it not work

1.change the ip address and back to old ip  add

2.check the configuration of GATEWAY AND SWITCH and cucm

3.upgrading  the firmware  image file of cucm

4.check for ip phone configuration

ip addre,default adds,subnet mask,tftp,

dhcp "disable"

5Refactor ip phone

6.Cnange the RMA

 WE ARE TRAYING TO TRACEOUT  PHONE IP ADDRES 100% SECCESS

Eg:show utility network traceout xx.xx.xx.xx

traceout from gataeway and os lavel of cucm 

but phone is not register

kindly help me this issue

[Chris Deren]

Is phone getting proper option 150 to point to CUCM TFTP IP address from DHCP? When you changed it to disable DHCP did you hard code this TFTP server on the phone?

What does the phone show in the status messages?

[kaleelkp984]

DHCP is Disabale, its not configured our CM ,

we are given the static configuration of  all the ip phone

DHCP already setup the  network team it is perfect ,

Remaining all the phone are working fine,only for one phone got problem

Phone status "unknown"

[Chris Deren]

You should not run DHCP on CUCM server, you run it on your centrelized or local DHCP server/router.

So, if you are using static IP addresses on the phone did you verify that you have set the TFTP server on the phone to point to CUCM server?

What does the phone show in the status messages on the phone?

[Chris Deren]

Hmm, rating of "1", I guess I upset you by asking proper question so that we can assist you with your issue.

Good luck my friend.

[kaleelkp984]

We are verify the TFTP Server on the phone,,,,,, ITS OK......

tftp server1 XX.XX.XX.XX(PRIMARY)

tftp server2 XX.XX.XX.XX(SECONDARY)

[devils_advocate]

Is there any sort of firewall which may be blocking TFTP traffic between the Phone and the TFTP server?

Are you able to ping/traceroute from the Router onsite to the TFTP server using the LAN as a source?

Failing that, try a factory reset on the phone and input the Static IP details and TFTP server addresses again. 

[kaleelkp984]

Hello Devils

thnks for valuable time,,,,,,,,,,,,,,,,

1,Is there any sort of firewall which may be blocking TFTP traffic between the Phone and the TFTP server?

it is not find out right now,,,can u plz assist how it do????

i thing it may blocking (its bank project)

before there is no problem for same ip phone it was registered state

2.Are you able to ping/traceroute from the Router onsite to the TFTP server using the LAN as a source?

We can able to pingable from router and CUCM to Ip phone,

Remote location side engineer also can possible ping PHONE IP

CMD#utilitles network tracout ip xx.xx.xx.xx

it showing  100 % packet reachable

3.Failing that, try a factory reset on the phone and input the Static IP details and TFTP server addresses again. 

same ip and tftp addres also same

[devils_advocate]

I can't help you find out if there is a Firewall, if you are implementing this as part of the IT team then you should be able to find out on your own if there is a firewall between the phone and the CUCM server, its not something I could know. If its for a bank then its likely there is a firewall.

Is the remote location connected via a VPN?

Does the SIP phone have a directory number assigned to it? I believe its needs to otherwise it won't register.