New IPX firmware version 1.7.8.5.0 for Simton IPX P101-1, IPX Office, IPX H500, and IPX Enterprise has been released in August 14th, 2009. The new releases included some improvements on PSTN line gain control, reduced the maximum IP extension number of H500 model, fixed some bugs related to VoIP line DID and daylight saving settings. The details are available in the release note in the download section.

If the current running firmware version is earlier than 1.6.8.0.0, you need to apply a patch before upgrading to this new firmware version. Note that the IPX model P101-1, H500, Office, and Enterprise cannot use software 1.8 or 2.1 versions.