Here's 3com's asterisk, v 1.4.1.1, with install instructions (it runs on an embedded type of board). I don't know anything else about this device and software, other than it has device os/flash and boot images. There's some manuals on hp's website for this device*. Hopefully this helps.
If this violates copyrights, please leave a comment and I'll remove it.
http://www.mirrorcreator.com/files/1DUSZHPW/3com_Asterisk_1.4.1.1__for_uploaded.net_.zip_links
* http://pro-networking-h17007.external.hp.com/us/en/support/converter/index.aspx?productNum=JF049A
