by the way, what is the latency in ms to determine if a packet is late?<div><br></div><div><br></div><div>Our ptime is 10ms, and the sender always sends packets in 8-12ms.</div><div><br></div><div>And I did use wireshark to capture packets on freeswitch server, no lost packet is found before reaching freeswitch.</div>
<div><br></div><div>When our ptime is 20ms, it gets better, but still has CN. </div><div><br></div><div>When we are using proxy/proxy media, every thing works great.</div><div><br></div><div>when sample rate is 16000, the quality of call is worst.  8000 gets better.</div>
<div><br></div><div><br></div><div>Any other suggestions?<br><br><div class="gmail_quote">On Wed, Feb 6, 2013 at 12:32 AM, Xijing Dai <span dir="ltr">&lt;<a href="mailto:dxj19831029@gmail.com" target="_blank">dxj19831029@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">I see.</span><div><span style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif"><br>

</span></div><div><span style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif"> </span><div><span style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">I did set it suppress_cng=true, and it did not help. No difference at all.</span><div>

<font color="#222222" face="arial, sans-serif"><br></font></div><div><font color="#222222" face="arial, sans-serif">This happens inside LAN.</font></div><div><br></div><div><font color="#222222" face="arial, sans-serif">When talking about the jitter buffer, we want to enable it on client, and disable it inside freeswitch. </font></div>

<div><font color="#222222" face="arial, sans-serif">Therefore, in this case, should freeswitch do nothing?</font></div><div><font color="#222222" face="arial, sans-serif"><br></font></div><div><font color="#222222" face="arial, sans-serif"><br>

</font></div><div><font color="#222222" face="arial, sans-serif">Cheers</font></div><div><div class="h5"><div><font color="#222222" face="arial, sans-serif"><br></font></div><div><font color="#222222" face="arial, sans-serif"><br>
</font></div>
<div><font color="#222222" face="arial, sans-serif"><br></font><br><div class="gmail_quote">On Tue, Feb 5, 2013 at 11:35 PM, Anthony Minessale <span dir="ltr">&lt;<a href="mailto:anthony.minessale@gmail.com" target="_blank">anthony.minessale@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Don&#39;t negotiate CNG in the SDP and it won&#39;t use it or disable it with suppress_cng=true in your channel or global vars.<div>

<br></div></div><div class="gmail_extra"><div><div><br><br><div class="gmail_quote">On Tue, Feb 5, 2013 at 4:32 AM, Steven Ayre <span dir="ltr">&lt;<a href="mailto:steveayre@gmail.com" target="_blank">steveayre@gmail.com</a>&gt;</span> wrote:<br>


<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Because if a RTP packet is due and hasn&#39;t arrived yet you need something to play. Audio isn&#39;t like TCP where you dropped packets can be retransmitted, if it hasn&#39;t arrived by the time you want to play it it&#39;s too late and you have to play silence to handle it.<div>




<br></div><div>Your audio problems are more likely due to packet loss or jitter which is why the RTP packet is overdue, not the CNG itself.</div><div><br></div><div>It jitter&#39;s the problem enabling the jitterbuffer might help (at the expense of increased lag). If loss is the problem there&#39;s no way to handle that except as silence for the missing interval, you need to fix whatever is causing the loss.</div>




<div><br></div><div>-Steve</div><div><br></div><div><br><div class="gmail_quote"><div><div>On 5 February 2013 10:23, Xijing Dai <span dir="ltr">&lt;<a href="mailto:dxj19831029@gmail.com" target="_blank">dxj19831029@gmail.com</a>&gt;</span> wrote:<br>




</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>Hey all,<div><br></div><div><br></div><div>Inside code</div><div><br></div><div>switch_rtp.c file:</div>


<div><br></div>

<blockquote>   static int rtp_common_read(switch_rtp_t *rtp_session, switch_payload_t *payload_type, switch_frame_flag_t *flags, switch_io_flag_t io_flags)<br>
                 ................<br>                 if (check || (bytes &amp;&amp; !switch_test_flag(rtp_session, SWITCH_RTP_FLAG_USE_TIMER))) {<br><span style="white-space:pre-wrap">			</span>if (!bytes &amp;&amp; switch_test_flag(rtp_session, SWITCH_RTP_FLAG_USE_TIMER)) {<span style="white-space:pre-wrap">	</span>/* We&#39;re late! We&#39;re Late! */<br>





<span style="white-space:pre-wrap">				</span>if (!switch_test_flag(rtp_session, SWITCH_RTP_FLAG_NOBLOCK) &amp;&amp; status == SWITCH_STATUS_BREAK) {<br><span style="white-space:pre-wrap">					</span>switch_cond_next();<br>





<span style="white-space:pre-wrap">					</span>continue;<br><span style="white-space:pre-wrap">				</span>}<br><span style="white-space:pre-wrap">				<br></span><span style="white-space:pre-wrap">				</span>return_cng_frame();  &lt;------- this lane to return cng frame if late.<br>





<span style="white-space:pre-wrap">			</span>}<br><span style="white-space:pre-wrap">		</span>}<br><br><br></blockquote>Could someone explain why we want to return cng frame when package is late? this is caused for me to hear very bad noise audio.<div>





<br></div><div>Can I disable return CNG frame?<br><div><br></div><div><br></div><div>Cheers<br><blockquote><br><br><br><br></blockquote></div></div>
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