improper display name setting in extensions prevents recording via that extension

If you set a display name for extension 123 to something like:
Bob Jones<9785551515>

When making a recording from that extension, in the /tmp directory the recording gets named 9785551515-ivrrecording.wav instead of 123-ivrrecording.wav. This prevents it from being copied to the sounds/custom directory and generates an error like the one below.

Unable to add /var/lib/asterisk/sounds/custom/asfasf.wav
- Can not read file!

This can be worked around by removing the display name info in the <> or renaming the file in the /tmp directory to the correct name before attemptingn to save it via the GUI.