I have a similar problem and in my case I found out that it was my G729
which is causing this issue.  When I switched to g711 (off course more
bandwidth) I have no issues...
 
It can be your nAT issue as well so make sure that you are ruling that out
first. Also, do you have issue in voice quality when you talk with some one
on the other side? the reason I m asking this is that it can be the audio
file format you are using for your voice prompts..
 
This is my take on this....
 
Syed
 
 
 
  _____  

From: Pittner, Zoltan [mailto:[EMAIL PROTECTED] 
Sent: Wednesday, November 01, 2006 10:45 AM
To: [email protected]
Subject: [on-asterisk] Sound quality question


Hello,
 
I have my asterisk (trixbox) server set up in my home environment.The
internet connection is through Rogers Cable, extreme edition, so there is
plenty of advertised bandwidth to both directions. (it is another fact that
these advertised values never live up to their advertised values...)
 
The system has two incoming lines, one POTS (Bell) through an SPA 3102, and
another directly from asterisk to Atlasvoice. When the phone rings, the
Digital receptionist announces: 
 
"Welcome to our telephone system, please hold the line till I transfer your
call."
 
Then it rings a predefined ring group. - I know this is long introduction,
but here comes the problem:
 
When a call comes in on the VOIP (Atlasvoice line) - I mean if I call my own
number from another land line I hear the following:
 
"Welcom. .. our .elephon. ..stem, pleas. ..ld the line ..ll I transf.. your
call"
 
Now, I got pissed off for this and I changed the MTU setting on my firewall,
brought it down from 1500 to 1462. For 2 days it was good, no losses. After
2 days, it is doing that again.
 
Also I have an extension in Hungary - on a softphone (IAXComm) - and I
almost all the time hear the same thing doesn't matter what the MTU setting
is. That made me think that this may be coming from somewhere else not the
MTU.
 
Do any of you have any idea what might be causing this?
 
Thank you,
Zoltan.

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