On Mar 11, 2006, at 6:25 AM, Whisker, Peter wrote:
The G.726 codec is the current Asterisk 1.2 version (revision 7221).
I am using G.711a (alaw) between a Sipura ATA and Asterisk at each end
of the link and am testing alternative codecs on an IAX link (not in
trunk mode) between the two Asterisk servers. (Yes, I know that the
Sipura can do G.726-32 also).
When I have G.726 switched in as the codec, it seems to add a little
gain as well as the clipping clicks. If I use G.711 on the
Asterisk-Asterisk link there is no problem. ADPCM seems to behave
better than G.726 but is percepibly "fuzzy".
GSM as I expected sounds like an old pre-EFR mobile phone. And the
rest are worse or like G.729 or Speex, eat processor power. I have
G.723 and G.729 compiled from the Intel distro.
Not to belabor to obvious, but you really want to eliminate any
translation if possible. I found in my setup that using uLaw over IAX
produced loud cracks for me? I could really trouble shoot this
further, but using G729 over IAX or using uLaw over SIP did not have
these issues.
I ended up using the SIP option, although I had really hoped to use
IAX. I think this might be an asterisk issue, but have no way to prove
it, so I am going to wait a while and if future releases help.
Again, to to restate the obvious, using G729 only eats CPU if it's
translating.
Good Luck,
marty
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