<br><br><div class="gmail_quote">On Jan 30, 2008 5:48 PM, Matthew J. Roth <<a href="mailto:mroth@imminc.com">mroth@imminc.com</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">Tomasz Zieleniewski wrote:<br>> I am using Debian OS kernel 2.6.22-3-amd64<br>> and zaptel driver 1.4 with ztdummy module for meetme application.<br>> I use meetme with SIP channels.<br>><br>
> I have such problem that when one connects to the conference voice is<br>> "cut".<br>> Each voice sequence is disturbed.<br>><br>> Does any one have similar issue and could give me some advice??<br>
</div>Tomasz,<br><br>Have you run zttest on the system? It verifies the accuracy of your<br>timing source. Digium recommends an accuracy of at least 99.98%. If<br>your accuracy is less than that it's probably the source of your problem.<br>
</blockquote><div><br>ztttest results show value below 99,98:<br><br>asterisk@venom:~/src/zaptel-1.4$ ./zttest -v -c 5<br>Opened pseudo zap interface, measuring accuracy...<br><br>8192 zaptel samples in 4096.232 system clock sample intervals (50.003%)<br>
8192 zaptel samples in 4064.232 system clock sample intervals (49.612%)<br>8192 zaptel samples in 4096.232 system clock sample intervals (50.003%)<br>8192 zaptel samples in 4096.240 system clock sample intervals (50.003%)<br>
8192 zaptel samples in 4096.232 system clock sample intervals (50.003%)<br>8192 zaptel samples in 4096.232 system clock sample intervals (50.003%)<br>8192 zaptel samples in 4096.232 system clock sample intervals (50.003%)<br>
8192 zaptel samples in 4064.232 system clock sample intervals (49.612%)<br>8192 zaptel samples in 4096.232 system clock sample intervals (50.003%)<br>8192 zaptel samples in 4096.232 system clock sample intervals (50.003%)<br>
8192 zaptel samples in 4096.240 system clock sample intervals (50.003%)<br>--- Results after 11 passes ---<br>Best: 50.003 -- Worst: 49.612 -- Average: 49.931827, Difference: 49.931827<br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>Luckily, it's a problem with multiple solutions. The following thread<br>documents some kernel configuration changes that you can make to improve<br>the quality of ztdummy as a timing source:<br><br> Recommendations for kernel config<br>
<<a href="http://lists.digium.com/pipermail/asterisk-users/2007-October/197778.html" target="_blank">http://lists.digium.com/pipermail/asterisk-users/2007-October/197778.html</a>> <br></blockquote><div><br>Do You know how can I check and set kernel timer frequency? </div>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br><br>My preferred solution is to use an empty TDM400P as a timing source. It<br>will cost you a little bit of money, but it's an easy way to reliably<br>
solve your problem. You'll find a few posts about it if you search the<br>list, but this one has most of the information you'll need:<br><br> Empty Wildcard TDM400P as a MeetMe timer.<br><<a href="http://lists.digium.com/pipermail/asterisk-users/2007-March/182005.html" target="_blank">http://lists.digium.com/pipermail/asterisk-users/2007-March/182005.html</a>><br>
<br>Regards,<br><br>Matthew Roth<br>InterMedia Marketing Solutions<br>Software Engineer and Systems Developer<br><br><br>_______________________________________________<br>-- Bandwidth and Colocation Provided by <a href="http://www.api-digital.com" target="_blank">http://www.api-digital.com</a> --<br>
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