On Fri, Oct 15, 2010 at 8:53 AM, Michelle Dupuis <span dir="ltr"><<a href="mailto:mdupuis@ocg.ca">mdupuis@ocg.ca</a>></span> wrote:<br><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
When a single call is up, call quality is fine. When a second call is up, outbound audio is immediately choppy. We're using ulaw, and confirmed that traffic with 2 calls is <175kbps in/out. (IAX connection out)<br>
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Asterisk doesn't report any dropped frames, the internet connection looks fine, etc. We have a linux router in place running wondershaper that seems to be running fine (same as our other installations).<br>
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Can someone suggest where to look? Could this be the ITSP?<br></blockquote><div><br><br>It could be your traffic shapper, the ITSP, your local network, the ISP's network, or the internet backbone - basically anywhere in-between.<br>
<br>You only have control over your local network, so I'd start there. Look for duplex mismatches (hint: if one end is set to "auto" or not able to be set manually, the other end should also be auto, never full [don't worry, they'll negotiate full, but only if both ends are set to auto; otherwise, the auto end will negotiate half due to the end running full not broadcasting capabilities when hardset]).<br>
<br>That said, I've never felt great about using the internet for phone calls - you can't controll anything else in the chain, so the possibility of problems is huge - and most of the time you can't fix it. I know lots of people here do it, but it's going to be problematic. If you want toll-quality voice, you still need either TDM lines or dedicated (non-internet) bandwidth.<br>
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