Hi Janet,
Here is the suggested method for the 7920/Loud Ringer;
Downloading Loud Ring Tones
The Cisco Wireless IP Phone 7920 running on Cisco CallManager Release 3.3(3) SR 1 or later provides support for special loud ring tones. The loud ring tones play at 136 dBA after being initially played at 125 dBA for 2 seconds; these are intended for use in noisy customer environments that require loud ring tones.
To load the loud ring tones on the Cisco Wireless IP Phone 7920, follow these steps:
Procedure
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Step 1 Download the loud ring tones zip file and Readme file from CCO
Step 2 Extract the ring tone files to your hard disk.
Step 3 To stop the TFTP service, from Cisco CallManager Administration, choose Applications > Serviceability> Tools > Control Center. Right-click Cisco TFTP and click Stop .
Step 4 Back up your current ring list file (ringlist.xml) because the new ring list file might not include all of your ring tones.
Step 5 Upgrade the Cisco Wireless IP Phone 7920 to the latest version firmware image file.
Step 6 Copy the special loud ring tone files (loudxxx.raw) and the associated ringlist.xml file into the C:\program files\Cisco\TFTPPath directory on the Cisco CallManager server.
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Note You must copy the ring tone files, not move them. If the ring tone files are moved, they will not inherit the correct permissions.
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Step 7 To restart the Cisco TFTP server, choose Applications > Serviceability> Tools > Control Center. Right-click Cisco TFTP and click Restart
Step 8 To download and select a loud ring tone as the current ring tone, power on the Cisco Wireless IP Phone 7920.
Step 9 Choose Menu > Phone Settings > Ring Tones > Download Ring Tone. The loud ring tones (loudxxx.raw) should be available for download on the phone.
Step 10 From the Download Ring Tone list, scroll to and select the desired loud ring tone. A check mark appears by the active ring tone.
Step 11 From the Cisco Wireless IP Phone 7920, choose Menu > Profiles to adjust the ring volume.
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Note Make sure the ring volume is tuned to the maximum setting. Alternatively, you can choose the "Outdoors" profile, which has the maximum volume setting preset.
From this good doc;
http://www.cisco.com/en/US/products/hw/phones/ps379/products_administration_guide_chapter09186a008047f982.html#wp1059569
Hope this helps!
Rob
