How to Make Phone Register to Different Node?

[the Q]

On CUCM System version: 9.1.2.11900-12

I have a site with 10 phones.  One phone is registering to the wrong node (subscriber). 

The primary node is specified in the xml file on the TFTP server, isn't it?  How do I change this?  I've wondered this a million times.  Is that setting in CUCM somewhere? What about phones that auto-register, or if a user brings a phone from the New York office to Chicago?  What node comes up?

Does the Device Pool have something to do with it, or the Call Manager Group? If I go to Device>>Phone and search for it, I see the rogue phone registered to the wrong node.  I don't have physical access, only remote to a jumpbox. 

I think I remember seeing some page in CUCM that had the MAC listed and the firmware load.  That would seem like a good place.

How do I change the node that a phone registers to?

thank you

[Jaime Valencia]

The CUCM group is what defines to what servers the phone will attempt to register to, in the order in which they're configured.

If it auto-registers, it gets the DP from the device defaults, or the one from the universal device template.

[the Q]

Hi Jaime,

But how do I make a phone register to a different node?

It's registering to sub-1.  I want it to register to sub-2. 

There is an XML file for every MAC, right? 

The primary and secondary servers are in the XML, right? 

The XML sits on the TFTP server, right? 

What if I downloaded, edited, and re-uploaded that XML file so it said sub-2 and sub-2?  That's a horrible solution, but would it work?  Is the XML file editable in CUCM somewhere? 

[Dennis Mink]

YOu will need to make sure the phone is assigned a call manager group with sub2 first then sub 1, create a device pool with this call manager group and assign that devicepool to the phone

Please rate if useful

[the Q]

Thank you Jaime and Dennis for helpful replies.

And Mohammed, your answer had everything I needed to know.  Thanks.

[Mohammed al Baqari · Accepted solution]

Hi,

If all phones are assigned to same DP which has one CUCM Server Group then they all should register to same node. I am assuming that this single CUCM Server Group has the right order (Sub-2 next Sub-1).

Assuming what I said is correct, then  you don't need to edit the XML file. If this is 7900 phone, try to reset network settings by hitting the sequence settings > **# > More > Erase

If this didn't work, try to factory default the phone by disconnection the power cable > hold the # button > while the button is held power-on the phone > keep holding it until the speaker button starts flashing > release # button and hit 123456789*0#. 

During phone registration after factory default make sure that phone firmware being loaded successfully. 

These should fix your problem.

On a side note, editing XML file and uploading it won't help because everytime TFTP server restarts or you apply new setting to phone by hitting 'Apply Config' a new xml file will be generated which will override your custom file.

The tftp files can be viewed and downloaded by navigating to http://<ip address oftftp>:6970/