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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>I am experiencing a situation where I am
getting intermittent choppy audio. Here is the network layout:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Termination provider -> IAX2 over the
Internet -> 20Mb fiber connection -> router -> Asterisk<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>My ATA connection goes into the router
between the fiber and the Asterisk server on another interface here is the
layout from me to Asterisk:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Sipura ATA (SPA1001 running 3.1.19(SE)
firmware), also tested with X-lite softest -> PIX 506 (although I have tried
multiple routers and direct connection to the radio try to fix the problem)
-> 1 mile 802.11b link to AP -> 15 mile 802.11b link Backhaul ->
router -> Asterisk<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>My Asterisk version is Asterisk 1.2.12.1,
Zaptel 1.2.9.1. <st1:place w:st="on">Ping</st1:place> times are ~10ms, jitter
is under 10 with an average of 5. QoS is enabled in the router for SIP, RTP and
IAX2 traffic going to and from the Asterisk box.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>When I experience the choppiness the ATA
reports packet loss on the web interface (Call 1 Packets Lost: ). I can run
something such as ping plotter from the same leg of the network that the Asterisk
box is on while this is happening and there is not even a small glitch of lost
packets on the network but the ATA displays otherwise. The only thing I have
come up with thus far is possible retransmissions on the wireless connection
(and due to the type of gear, I’m not able to see this data). We are way
out in the country with no other real providers even close so I’m
doubting interference although I suppose it is a possibility keeping an open
mind. My question is can anyone point me to any possible reasons this would be
happening? Also can anyone tell me other reasons other than real lost packets
that the ATA would show this? My only guess on that was packets that never got
an ACK due to server congestion or some other reason other than actual loss. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Any insight appreciated!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Thanks<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Curt <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
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