Aastra recently announced Aastra Hi-Q Audio Technology.  From Aastra’s website:

Aastra Hi-Q™ enhances the clarity of voice calls making it easier to understand all that is said. Providing a truly superior voice experience and greater productivity, the benefits of this enriched sound can be clearly heard on both handset and speakerphone.

Aastra’s Hi-Q audio technology is a software based acoustic optimization, backwards compatible with existing 67xxi series SIP phones, delivering a more life-like conversation and richer user experience via an industry standard G.722 wideband codec.

This innovative software-only upgrade works on existing hardware and is included in 67xxi firmware version 2.5.0 or later – available as a free download from Aastra. Once configured, it is automatically activated for calls that successfully negotiate the use of G.722 codec.

Aastra SIP Phones that support Hi-Q include: 6757i CT, 6757i, 6755i, 6753i, 6751i, 6731i and 6730i.

To access the software downloads, please click here to visit the Aastra support download section.