I had a similar problem upgrading from 3.2.3 to 3.2.4 on CUCM 5. 3.2.3 did not work very well with our Toshiba faxes - they showed large numbers of dropped and errored packets on session startup, and the fax dropped out. After much wailing and nashing of teeth, TAC came up with a fix, which was:
Generate the atadefault.cfg which also includes a load information, and save this file to TFTP network locale path, for example "\United_States\atadefault.cfg". ATA will try this file if it cannot get cnf.xml.
You can find how to create atadefault.cfg file following by the link:
1. Upload the "atadefault.cfg" file to the "united_states" locale directory.
a. Login to the CM at: https:///cmplatform or select "Cisco Unified OS Administration" from the Navigation menu. b. Select Software Upgrades > TFTP File Management c. Click Upload File. The "Upload File" window pops up. d. Fill in the fields as follow. Uplolad File: atadefault.cfg Directory: united_states
Use the Browse button to find the atadefault.cfg file or specify the full path and file name.
e. Click Upload File button. f. Click Close button.
2. Restart the TFTP server
a. Login to the CM at: https:///ccmservice or select "Cisco Unified Serviceability" from the Navigation menu. b. Select Tools > Control Center - Feature Services c. Select Cisco Tftp radio button in the "CM Services" section. d. Click the green arrow with a square (restart icon) at the top or Restart button at the bottom to restart the TFTP server. Click OK to any popup window. The Status line at the top of the page should display "Cisco Tftp Service Restarted Successfully."
3. Configure the ATAs to use the "united_states" locale directory when requesting its configuration files.
a. Login to the CM at: https:///cmplatform or select "Cisco Unified OS Administration" from the Navigation menu. b. Select Device > Phone. c. Click the name of an ATA device d. Set the Network Locale parameter to United States in the Device Information section.
For a single or very few ATAs, they may be configured manually by using the above procedure. For many ATAs, it is recommended to create a device pool with Network Locale set to "United States" and then use the CM BAT tool to reconfigure them.
4. Reset the ATAs to request the atadefault.cfg file from the united_states locale directory.
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