<div dir="ltr">Thanks for the reply<div>I am afraid that the client is running some older firmware on the various different SIP phone models. Most are at version 11-5-1SR1-1</div><div>As for Cisco documentation, it is becoming somewhat less useful as time goes on.</div><div>My pet peeve is searching through Bug Search and finding nothing. Then involving TAC and being pointed to a Bug ID that should have shown in my search.</div><div>Not sure if my search fu is bad or the Bug Search tool is "not helpful". (A nice way of saying not worth shit).</div><div><br></div><div><div>Russell Goings (AM)</div><div>IPT Engineer – Dimension Data</div><div>Direct Line 571-203-4021</div><div><a href="mailto:russell.goings@dimensiondata.com">russell.goings@dimensiondata.com</a></div><div>Monday – Friday 8:00 – 5:00 EST</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 6, 2018 at 12:10 PM, Charles Goldsmith <span dir="ltr"><<a href="mailto:wokka@justfamily.org" target="_blank">wokka@justfamily.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Anthony, it doesn't help that the SRND is also lighter in terms of total number of pages than it used to be. Back in the 8.x days, it was over 1400 pages. With all of the new technology and features added through to version 12.x, you would expect it to get larger, not smaller.<div><br></div></div><div class="HOEnZb"><div class="h5"><br><div class="gmail_quote"><div dir="ltr">On Fri, Apr 6, 2018 at 10:31 AM Anthony Holloway <<a href="mailto:avholloway%2Bcisco-voip@gmail.com" target="_blank">avholloway+cisco-voip@gmail.<wbr>com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I'm a little surprised that the spec for DNS support is not well documented. It should be in the SRND. Especially since DNS + Certificates are more common place today.</div><br><div class="gmail_quote"><div dir="ltr">On Fri, Apr 6, 2018 at 9:03 AM Wes Sisk (wsisk) <<a href="mailto:wsisk@cisco.com" target="_blank">wsisk@cisco.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Looks like it was known broken at one point:
<div><br>
The DNS Query Response TTL of the secondary DNS server is not being respected by the 9971/9951/8831 phones if the primary server goes down after the first request.<br>
Resolution Summary<span class="m_-4326827410139818379m_1279408043326481244m_-5226121600763353737Apple-tab-span" style="white-space:pre-wrap"> </span>
<div>CSCut29536 for 8831 IP Phones </div>
<div>CSCut29519 for 99xx IP Phones </div>
<div>CSCut75647 for 8811/51 IP phones </div>
<div><br>
</div>
<div>So versions and deeper dive required.</div></div></div><div style="word-wrap:break-word"><div>
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<div>-Wes</div></div></div><div style="word-wrap:break-word"><div>
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<div>
<div>On Apr 5, 2018, at 3:14 PM, Russell Goings <<a href="mailto:russgoings@rgoings.com" target="_blank">russgoings@rgoings.com</a>> wrote:</div>
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<div dir="ltr">Hi all
<div> I have a client who was doing some network mucking around and part of that maintenance caused the two DNS servers used by a group of IP phones to go unavailable. Some of these phones went unregistered with a reason code 13 - TCP KeepAlive
Timeout. </div>
<div><br>
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<div>What I (OK not me. Just the client. Well maybe I am interested as well) would like to know is how do the Cisco SIP phones, particularly the 8851 model, deal with the TTL from the DNS response. </div>
<div><br>
</div>
<div>Does the phone honor the DNS TTL and cache the response for 24 hours?</div>
<div><br>
</div>
<div>Does the phone have a different cache time for the DNS response?</div>
<div><br>
</div>
<div>Does it make a new DNS query every time it sends a keep-alive?</div>
<div><br>
</div>
<div>I have never looked into this before and on this Thursday afternoon my Google-fu is weak.</div>
<div><br>
</div>
<div>And the incident was over a week ago so not much from the phone logs to help.</div>
<div><br>
</div>
<div>Thanks</div>
<div><br>
</div>
<div>
<div>Russell Goings (AM)</div>
<div>IPT Engineer – Dimension Data</div>
<div>Direct Line <a href="tel:(571)%20203-4021" value="+15712034021" target="_blank">571-203-4021</a></div>
<div><a href="mailto:russell.goings@dimensiondata.com" target="_blank">russell.goings@dimensiondata.<wbr>com</a></div>
<div>Monday – Friday 8:00 – 5:00 EST</div>
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