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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Brian,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Let’s say that I’m rather experimenting then writing a new module.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">In the switch_ivr_play_file() I’ve just skipped IF condition which checks the status of channel flag CF_HOLD.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hold operation is called from our application layer by switch_api_execute(“uui_hold”,…).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Miro<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Brian West [mailto:brian@freeswitch.org]
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<b>Sent:</b> Thursday, November 3, 2016 8:05 PM<br>
<b>To:</b> FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org><br>
<b>Subject:</b> Re: [Freeswitch-users] Jitter during on-hold<o:p></o:p></span></p>
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<p class="MsoNormal">So it sounds like you're writing your own module, How are you doing this hold operation?<o:p></o:p></p>
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<p class="MsoNormal">/b<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Nov 3, 2016 at 10:53 AM, Miroslav Levanic <<a href="mailto:Miroslav.Levanic@enghouse.com" target="_blank">Miroslav.Levanic@enghouse.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hello,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’m trying to play from file when other party is set on–hold.
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">reINVITE sent by FreeSwitch contains sendonly attribute which opens possibility that FreeSwitch can play something to other end although other party is on-hold.
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’ve used modified switch_ivr_play_file() function which by default prevents sending rtp packets to other side when call is on-hold.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’ve encountered rtp stream issue causing distorted audio due to dropped packets on the caller end. <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Codec used is G.711 mulaw 8kHz and ptime is 20ms accepted on both side, FreeSwitch and softphone. Both endpoints are located in the local LAN.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Wireshark rtp analysis shows that when call is not on-hold, packets comes in interval of 20ms as expected. But when the call is set on-hold, average delta time between packets is
21ms, causing dropping packet every second (1ms extra time multiplied by 50 packets per second) with jitter buffer set to 50ms in Wireshark.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Setting "auto-jitterbuffer-msec" parameter in sofia did not help.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Is there a serious reason why I cannot use switch_ivr_play_file() during on-hold and what could cause jitter only during on-hold period? When call is retrieved from hold, jitter
disappears and audio is good again. <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Miro<o:p></o:p></p>
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_________________________________________________________________________<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p><b><i><span style="font-size:13.5pt;font-family:"Courier New"">Brian West</span></i></b><span style="font-family:"Courier New""><br>
</span><span style="font-size:10.0pt;font-family:"Courier New""><a href="mailto:brian@freeswitch.org" target="_blank">brian@freeswitch.org</a></span><o:p></o:p></p>
<p><span style="font-size:7.5pt;font-family:"Courier New";border:solid windowtext 1.0pt;padding:0cm"><img border="0" width="100" height="100" id="_x0000_i1025" src="cid:~WRD000.jpg" alt="Image removed by sender."></span><o:p></o:p></p>
<p><b><i><span style="font-size:10.0pt;font-family:"Courier New"">Twitter: @FreeSWITCH , @briankwest</span></i></b><span style="font-size:10.0pt;font-family:"Courier New""><br>
<a href="http://www.freeswitchbook.com" target="_blank">http://www.freeswitchbook.com</a> (50% Discount using code FreeSwitch50)<br>
<a href="http://www.freeswitchcookbook.com" target="_blank">http://www.freeswitchcookbook.com</a> </span><span style="font-family:"Courier New"">(50% Discount using code FreeSwitch50)</span><span style="font-size:10.0pt;font-family:"Courier New""><br>
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<p><span style="font-family:"Courier New"">Got Bugs? Report them <a href="https://freeswitch.org/jira" target="_blank">
here</a>! | Reddit: <a href="https://www.reddit.com/r/freeswitch" target="_blank">/r/freeswitch</a></span><o:p></o:p></p>
<p><b><span style="font-size:10.0pt;font-family:"Courier New"">T:</span></b><span style="font-size:10.0pt;font-family:"Courier New"">+19184209001 |
<b>F:</b>+19184209002 | <b>M:</b>+1918424WEST (9378)<br>
<b>iNUM:</b>+883 5100 1420 9001 | <b>ISN:</b>410*543 | <b>Skype:</b>briankwest</span><o:p></o:p></p>
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