It was simply a matter of friendship but also the strong interest on the part of several thousand members of DIDX that encouraged me to interview Anthony Minessale and Brian West of FreeSWITCH™ yesterday in podcast format. I didn't realize how many would listen in. Some asked for more information especially about the HD conferencing progress.
Just a two letter prefix "HD" to telephony is a hit around the globe. Anthony explains in an article on FreeSWITCH™ site the original definition, history, and technology of HD. He mentions, "... higher quality audio shines is when you have several phones on the same network that support HD-audio."
And... "There is a misconception that because the quality of the audio is higher, then the amount of bandwidth necessary to transport that audio must also increase by the same factor. "
Finally... "Many new SIP phones now support high quality audio using g722 as well as low bandwidth codecs such as g729."
Many comments directly to me on email in regards to the FreeSWITCH™ podcast included actually a question; which phones are compatible to this technology? I'd love to see comments directly on this post from readers to answer this question.
See additional and extremely pertinent information at http://www.freeswitch.org/node/104. And... meet with global open source developers at http://www.cluecon.com Aug. 4-6, 2009 in Chicago. Facebook has a pre, during, and post networking area at Cluecon on Facebook. Our DIDXchange media channels are a media partner for Cluecon '09.
Just a two letter prefix "HD" to telephony is a hit around the globe. Anthony explains in an article on FreeSWITCH™ site the original definition, history, and technology of HD. He mentions, "... higher quality audio shines is when you have several phones on the same network that support HD-audio."
And... "There is a misconception that because the quality of the audio is higher, then the amount of bandwidth necessary to transport that audio must also increase by the same factor. "
Finally... "Many new SIP phones now support high quality audio using g722 as well as low bandwidth codecs such as g729."
Many comments directly to me on email in regards to the FreeSWITCH™ podcast included actually a question; which phones are compatible to this technology? I'd love to see comments directly on this post from readers to answer this question.
See additional and extremely pertinent information at http://www.freeswitch.org/node/104. And... meet with global open source developers at http://www.cluecon.com Aug. 4-6, 2009 in Chicago. Facebook has a pre, during, and post networking area at Cluecon on Facebook. Our DIDXchange media channels are a media partner for Cluecon '09.
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FYI,
eyeBeam soft phones will use the Speex codecs, so you can try those out. Another fun trick is to use FreeSWITCH as your softphone. A number of techies do this: load FS on laptop, plug in nice headset, use portaudio at FS command line. Be sure to load mod_celt and mod_siren to get the extra HD codecs.
Come to #freeswitch on irc.freenode.net if you want to discuss it more.
-MC
Polycom's IP6000 supports the siren codec at 32k and all snom phones support the 722 codec at 16k.
With the CELT codec, you can actually keep wideband quality across multiple sites using about the same bandwidth as PCMU (at the cost of a bit of transcoding on both sides).
Devices talk 722, 722.1, 722.1c, or <name your favorite codec here> to the local FreeSWITCH box, then it transcodes to celt over public to the other FreeSWITCH box for awesome sounding audio the whole way