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 Post subject: codec quality question??
PostPosted: Thu Oct 05, 2006 2:15 am 
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Joined: Mon May 29, 2006 7:07 pm
Posts: 287
Location: Denver
# GSM - 13 Kbps (full rate), 20ms frame size
# iLBC - 15Kbps,20ms frame size: 13.3 Kbps, 30ms frame size
# ITU G.711 - 64 Kbps, sample-based Also known as alaw/ulaw
# ITU G.722 - 48/56/64 Kbps
# ITU G.723.1 - 5.3/6.3 Kbps, 30ms frame size
# ITU G.726 - 16/24/32/40 Kbps
# ITU G.728 - 16 Kbps
# ITU G.729 - 8 Kbps, 10ms frame size
# Speex - 2.15 to 44.2 Kbps
# LPC10 - 2.5 Kbps

which codec is the best to use and gives the best voice quality??
I'm using g729 ( $10/per channel ) now.
I'm trying to figure out how to get the best quality of conversation for my customers. I know it depends on many things - DID quality + asterisk settings and etc.......
Sometimes i notice when i call my asterisk the ivr announcement even breaks up - what could it be the cause of that???


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 Post subject: Sound Quality
PostPosted: Sat Jan 13, 2007 9:22 pm 
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Joined: Mon Jan 08, 2007 6:56 pm
Posts: 345
gsm/ulaw/alaw should work just fine without much overhead.

try a newer setup on a spare server eg: latest svn asterisk 1.4, fedora5, php5, mysql5.

not a piece of cake to setup but it works great!

(note that digium recommends fedora for asterisk)


Caveat: English digits are read when spanish is selected by caller in a2billing.

haven't fixed this yet.


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 Post subject:
PostPosted: Sat Jan 13, 2007 9:48 pm 
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Joined: Mon May 29, 2006 7:07 pm
Posts: 287
Location: Denver
thanks for info. I'll try.


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