[asterisk-users] local channels and g729a voice quality

[Roi Stork]

Hi,

We noticed a very sharp drop in voice quality when using digium g729a
codec. The problem seems to happen if the A channel (caller's channel)
is a landline/mobile number contacted using the same outgoing provider
(as a local channel). It sounds like listening to a mono speaker on
low volume.

If I use a softphone that is directly registered to our asterisk box
the audio quality improves, the words come out more clearer and
louder.

I also asked my provider to test call me using their Cisco as5300
system and g729 codec and compared it with ulaw. The difference is
unnoticable.