Try below
Host Configuration Files
You can host configuration files on any TFTP server. However, Cisco recommends hosting configuration files on the Cisco Unified Communications Manager TFTP server, which is the same as that where the device configuration file resides.
Procedure
Step 1 Open the Cisco Unified OS Administration interface on Cisco Unified Communications Manager.
Step 2 Select Software Upgrades > TFTP File Management.
Step 3 Select Upload File.
Step 4 Select Browse in the Upload File section.
Step 5 Select the configuration file on the file system.
Step 6 Do not specify a value in the Directory text box in the Upload File section.
You should leave an empty value in the Directory text box so that the configuration file resides in the default directory of the TFTP server.
Step 7 Select Upload File.
Restart Your TFTP Server
You must restart your TFTP server before the client can access the configuration files.
Procedure
Step 1 Open the Cisco Unified Serviceability interface on Cisco Unified Communications Manager.
Step 2 Select Tools > Control Center - Feature Services.
Step 3 Select Cisco Tftp from the CM Services section.
Step 4 Select Restart.
A window displays to prompt you to confirm the restart.
Step 5 Select OK.
The Cisco Tftp Service Restart Operation was Successful status displays.
Step 6 Select Refresh to ensure the Cisco Tftp service starts successfully.
What to Do Next
To verify that the configuration file is available on your TFTP server, open the configuration file in any browser. Typically, you can access the global configuration file at the following URL: http://tftp_server_address:6970/jabber-config.xml
Configuration File Structure
You create client configuration files in an XML format that contains the following elements
XML Declaration
The configuration file must conform to XML standards and contain the following declaration:
<?xml version="1.0" encoding="utf-8"?>
Root Element
The root element config, contains all group elements. You must also add the version attribute to the root element as follows:
<?xml version="1.0" encoding="utf-8"?>
<config version="1.0">
</config>
Group Elements
Group elements contain configuration parameters and values. You must nest group elements within the root element.
XML Structure
XML Structure
The following snippet shows the XML structure of a client configuration file:
<Client>
<parameter>value</parameter>
</Client>
<Directory>
<parameter>value</parameter>
</Directory>
<Options>
<parameter>value</parameter>
</Options>
<Phone>
<parameter>value</parameter>
</Phone>
<Policies>
<parameter>value</parameter>
</Policies>
<Presence>
<parameter>value</parameter>
</Presence>
<Voicemail>
<parameter>value</parameter>
</Voicemail>
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/jabber/10_6/CJAB_BK_C56DE1AB_00_cisco-jabber-106-deployment-and-installation-guide/CJAB_BK_C56DE1AB_00_cisco-jabber-106-deployment-and_chapter_01010.html
https://www.ucguru.com/jabber-configuration-with-jabber-config-xml/
HTH
JB
