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<p>Well, I thought I had the problem solved. Ported everything over
to PJSip and build RDNS records for the phones and the server, but
I am still experiencing the problem on incoming calls.<br>
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<div class="moz-cite-prefix">On 6/7/2016 1:00 PM, Faheem Muhammad
wrote:<br>
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cite="mid:CA++nn_zqEhOPm8fhU_uUO3SX6Z0G88VObiLyG=sEo03MfycsvQ@mail.gmail.com"
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<div dir="ltr">I've faced the same issue. The issue was related to
DNS, the reverse lookup query failure caused the delay
around(7-9 seconds). The purpose of reverse lookup is to block
IP Spoofing attacks.
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<div>Regards,</div>
<div>Faheem </div>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Jun 7, 2016 at 7:48 PM, Brent
Davidson <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:brent@texascountrytitle.com" target="_blank">brent@texascountrytitle.com</a>></span>
wrote:<br>
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<p>I am having an issue with a couple of phones where they
ring, but there is a long delay after the phone is
picked up before the audio starts. <br>
</p>
<p>My setup: <br>
</p>
<ul>
<li>Server running Asterisk 13.9.1, Dahdi 2.11.1 w/
OSLEC</li>
<li>Server is CentOS 7<br>
</li>
<li>Quad core CPU with 16GB Ram</li>
<li>2 Snom 300 phones.</li>
<li>NO NAT. Server and phone are on the same subnet
with only a gigabit switch between them.</li>
<li>Digium TDM400 analog card with 2 incoming analog
PSTN lines<br>
</li>
</ul>
<p>When a call comes in, the system answers, IVR plays,
caller dials an extension, Snom 300 rings, handset
picked up. Caller continues to hear ringing for another
7 to 10 seconds. Answerer hears a click, a quick burst
of audio, then silence, then another click and audio is
engaged.</p>
<p>I have tried both SIP and RTP debugging and there are
absolutely no messages indicating any timeout or
retransmit. I am at a total loss. In the past I've
always been able to find an answer to issues like this
on my own, but this time I just don't know. I was even
beginning to suspect the network switch might be bad,
but pinging between the server and the phones shows no
packet loss and 0.969ms average response time.<br>
</p>
<p>What am I missing<b>?</b></p>
Thanks,<br>
Brent Davidson<b><br>
</b> </div>
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