HDSP stands for High Definition Sound Performance. It's a new Gigaset innovation that lets you phone over the internet in wideband audio quality – and enjoy conversations in twice the sound quality of a normal phone call.

Thanks to a frequency band twice that of standard phones, Gigaset's High Definition Sound Performance phones let you experience internet (VoIP) conversations in unparalleled sound quality. This extended frequency range means HDSP calls can transmit more audio details than ever before, eliminating much of the static and interference common to normal phone calls. As a result, you can hear every inflection in the voice of the person you're talking to – and experience calls that sound more like face-to-face conversations.

High Definition Sound Performance provides wideband audio quality by using a frequency range double that of conventional phones. Standard phones use a frequency band of 4 kHz, while HDSP capable Gigaset cordless phones take advantage of 8 kHz. The extended frequency range means that when you call a friend or relative who also has an HDSP phone via your broadband internet connection you'll be able to hear them twice as clearly.

Thanks to greatly increased data compression provided by audio Codec G.722, you can enjoy HDSP calls in 8 kHz wideband audio - double the bandwidth of narrowband 4 kHz calls.

HDSP also uses a new wireless technology called CAT-iq, which stands for Cordless Advanced Technology – internet quality. CAT-iq builds upon existing Digital Enhanced Cordless Telecommunications (DECT) technology, uniting telephony and the internet in a way that enables a vast array of new functions for end-user devices. CAT-iq offers all the benefits of DECT technology and also ensures compatibility among IP products - resulting in greater functionality.

To take advantage of the wideband audio quality of High Definition Sound Performance you'll first need a Gigaset HDSP capable cordless phone, such as the Gigaset S675 IP. You can then plug your phone into a router, such as the Gigaset SE366 WLAN, which in turn connects to your broadband internet connection. You'll then be able to phone with a friend or family member who also has an HDSP capable phone – and talk to them in unrivaled sound quality.