What's HDSP?
HDSP stands for High Definition Sound Performance. It's a new Siemens 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.
What are the benefits of HDSP?
Thanks to a frequency band twice that of standard phones, Siemens 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.
How does HDSP work?
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 Siemens 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.
What IP standards does HDSP use?
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.
What do I need?
To take advantage of the wideband audio quality of High Definition Sound Performance you'll first need a Siemens Gigaset HDSP capable cordless phone, such as the Siemens Gigaset S675 IP. You can then plug your phone into a router, such as the Siemens 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.
Will HDSP work when one of the callers is using a sip provider that only supports G.729 or G.711 ?
Hi there,
I've finally got round to upgrading my Asterisk server at home to 1.6 (1.6.0.3 to be exact).
I wanted to see if I could get the phones to negotiate G.722; however it does not appear to be working. When I force each end to use only G.722 and enable debugging in Asterisk, I can see the server advertising that codec, but the Gigaset (S675IP) is apparently advertising no audio capability. If I enable other codecs on the Gigaset I can see them listed, but G.722 is never there.
Does anyone know what version of the G.722 codec the Gigaset uses and/or whether there's a known compatibility problem with Asterisk?
Cheers,
Chris
I have an S685IP and know that it works well with my Polycom IP650, which is also G.722 capable. My Asterisk server is not at present G.722 capable, but I would expect that to work as well.\
Note that there's a nice automatic G.722 test sequence available at the SIP URI wbdemo@conf.zipdx.com
Hi Michael,
Thanks for that; I've since tried version 1.6.0.5 without success either. I'll give that SIP URI.
Cheers,
Chris
Hi there,
just managed to get the HDSP working on my S685IP phones, both phones need to register they name on gigaset.net (does not work to dial only their number 212464144999#9) :(
Sound is briliant.