Polycom has recently released version 3.2.0 of their SoundPoint IP SIP application.  Version 3.2.0 is a new feature release that replaces SIP 3.1.3RevC.  More recently ‘patch version’ 3.2.1 has been released which fixes a few issues with the 3.2.0 release.  The full list of features of the 3.2.0 release can be found in the Polycom release notes for 3.2.0 online.  The fixes to 3.2.0 can be found in the 3.2.1 release notes.  With the release of the 3.2.0 firmware, some phone models are no longer supported.  Below is a list of the models that will no longer be supported beyond 3.2.0:

SoundPoint IP 301
SoundPoint IP 501
SoundPoint IP 600
SoundPoint IP 601
SoundStation IP 4000

To download either the 3.2.0 or 3.2.1 release start by selecting your model of phone on the Polycom SoundPoint IP support pages.  As usual, be sure to read the upgrade notes before undertaking any new firmware upgrade.