Sipura provide firmware updates for their SPA-3000 analogue VoIP adapter. They include a Windows program to upgrade the firmware, which is of no use to those of us who don't use Windows.

Fortunately, it's very easy to upgrade the firmware via tftp, http or https. All you need is access to a tftp, http or https server.

To upgrade the firmware without using a Windows PC:

• Download the new firmware from Sipura's support page.
• Extract the firmware from the archive and copy it to your tftp or web server.
• Load this URL into a browser:

      http://your.spa3000.ip.address/upgrade?url
  

  where url is the url of the location of your new firmware file, e.g. http://kirriwa.net/john/doc/spa3000-03-01-10-GW-d.bin This is Sipura's firmware version 3.1.10d - feel free to use this URL but if it breaks your SPA3000 you can keep both halves. And don't tell me, I don't want to know.
• Wait until the status LED on the SPA3000 stops flashing fast.
• Enjoy your new firmware :-)

Note: I've read reports that echo is worse with v3.x firmware than with v2.x. I didn't run v2.x for very long - I had problems with incoming caller ID with v2.0.13g, which were fixed in v3.1.10d, and I didn't try to solve my echo problems until after I upgraded, so I can't say whether v2.x was any better.