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Hey Nate ... the original ask I think, was to do it all with DNS only and no intervention at layer 4, which to my knowledge, DNS alone couldn’t do.
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<div>Expressway search rule, CUCM LUA script... etc could all do it in reality.</div>
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<div>However, the actual goal appears to be dialing a Webex cloud registered codec, using a non cloud uri (...@rooms.webex.com), and for that Webex Hybrid calling with Expressway B2B would get you there, and also checks the “no additional transformation needed”
box.<br>
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Oct 4, 2019, at 22:41, NateCCIE <nateccie@gmail.com> wrote:<br>
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<div dir="ltr"> I am not thinking right? Can’t a dns srv get the call routed to a specific host? Then a quick expressway transform to change the domain, and you’re done.
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<div>Think of it as a different internal domain va external domain.</div>
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<div>Foo@company.com does goes to expressway.companyinfrastructuredomain.com which does a quick trans to foo@internal.local</div>
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Oct 4, 2019, at 8:36 PM, Lelio Fulgenzi <lelio@uoguelph.ca> wrote:<br>
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Interesting. I’ll have to look into that. Thx. <br>
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<p class="MsoNormal" style="margin: 0in 0in 0.0001pt;"><span style="background-color: rgba(255, 255, 255, 0);"><b>Lelio Fulgenzi, B.A.</b> | Senior Analyst<o:p></o:p></span></p>
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On Oct 4, 2019, at 10:32 PM, Ryan Huff <<a href="mailto:ryanhuff@outlook.com">ryanhuff@outlook.com</a>> wrote:<br>
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<div dir="ltr">Webex Hybrid Calling (with Expressway B2B), could in theory, help accomplish this. The codec is still cloud registered, though Hybrid calling would allow for an on-prem URI to be associated with the Webex remote destination of the codec.
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<div>The call would come into the on-prem URI via B2B like normal, and assuming the Hybrid integration was setup correctly, ring the Webex remote destination which rings the cloud registered codec.</div>
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<div>It’s a little bit of an ugly trombone, but it does work..<br>
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Oct 4, 2019, at 22:09, Lelio Fulgenzi <<a href="mailto:lelio@uoguelph.ca">lelio@uoguelph.ca</a>> wrote:<br>
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Darn. Double darn.
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<div>Let’s hope webex offers up custom domain registration for devices soon. </div>
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<div>‘Cause <a href="mailto:room123@acme.rooms.webex.com">room123@acme.rooms.webex.com</a> is a bit much. <br>
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<p class="MsoNormal" style="margin: 0in 0in 0.0001pt;"><span style="background-color: rgba(255, 255, 255, 0);"><b>Lelio Fulgenzi, B.A.</b> | Senior Analyst<o:p></o:p></span></p>
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On Oct 4, 2019, at 9:05 PM, Ryan Huff <<a href="mailto:ryanhuff@outlook.com">ryanhuff@outlook.com</a>> wrote:<br>
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<div dir="ltr">What it sounds like you are trying to do to me, is allow the call to ultimately setup with a URI different than the URI that was dialed, without the calling party being the wiser.
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<div>DNS won’t be able to do anything with regards to that I don’t think, because it really sounds like you’re trying to manipulate/transform the called URI, and you’ll need something to interact with the SIP message stack for that I’d think.</div>
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<div>You can create a round robin A record, that resolves to multiple IP addresses, so when the client looks up the DNS SRV, it receives multiple targets to try before considering the SRV target “unreachable” (SRV weights and priorities determine the ordering
of the target addresses resolved for the client). However, this won’t have the ability to change the called URI, which is ultimately what I think you’re attempting in the scenario (DNS and SIP messages are on different networking layers).</div>
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<div>As Dave mentioned below, Expressway or a LUA script (sip normalization) in CUCM seems to be uniquely qualified for what you’re wanting to do.<br>
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Oct 4, 2019, at 20:40, Lelio Fulgenzi <<a href="mailto:lelio@uoguelph.ca">lelio@uoguelph.ca</a>> wrote:<br>
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I’ve seen some references to Cisco SIP proxy server.
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<div>Would that help?<br>
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On Oct 4, 2019, at 7:46 PM, Ryan Huff <<a href="mailto:ryanhuff@outlook.com">ryanhuff@outlook.com</a>> wrote:<br>
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<blockquote type="cite">
<div dir="ltr">According to RFC 2782 (<a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Frfc%2Frfc2782.txt&data=02%7C01%7C%7C9b720a4af69b41bebb5008d7493d7691%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637058400631429128&sdata=OAmRMMzoz0YfzhuHqJuiHYHNI9JHtJrfTTEeesLBbDg%3D&reserved=0" originalsrc="https://www.ietf.org/rfc/rfc2782.txt" shash="zfRaJCl0lW6ahLnaVsz/CHkv9gU1gMneLdRnL0LQEvK33LYPpvXAT8HS+uLUFq4Uvp9UXQYcwYaJxuqzrNRaf5cSYQiAsMCAOB431wae/lXJYOmC/ltmD/21GRbJhysZxORty4VCdaMy2XjqSbkTKw8ec2rBn47/040CCEShdmc=">https://www.ietf.org/rfc/rfc2782.txt</a>),
it does not, under the “Target Definition”; “there must be one or more address records for this name, the name must not be an alias”.
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<div>However, I can tell you that I have used a CNAME in the SRV target field before, and it appeared to work at the time. Still, depending on the application, doing so could potentially cause some weird issue with regards to PTR or something.<br>
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Oct 4, 2019, at 19:10, Brian Meade <<a href="mailto:bmeade90@vt.edu">bmeade90@vt.edu</a>> wrote:<br>
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<div dir="ltr">I don't think DNS SRV records support CNAME. Even then, it would only change where it was sent to and not the SIP headers.</div>
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<div dir="ltr" class="gmail_attr">On Fri, Oct 4, 2019 at 12:26 PM Lelio Fulgenzi <<a href="mailto:lelio@uoguelph.ca">lelio@uoguelph.ca</a>> wrote:<br>
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<p class="MsoNormal">Yeah – I’d want this to happen all within DNS. But of course, in a supported fashion. I’m not interested in spending time modifying infrastructure at this time.<u></u><u></u></p>
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<p class="MsoNormal">I’ve done some searching, and there’s talk of RR records, but we haven’t found much documentation.<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:Arial,sans-serif">---<u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-family:Arial,sans-serif">Lelio Fulgenzi, B.A.</span></b><span style="font-family:Arial,sans-serif"> | Senior Analyst<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(51,51,51)">Computing and Communications Services</span><span style="font-family:Arial,sans-serif"> | University of Guelph<u></u><u></u></span></p>
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<a href="mailto:lelio@uoguelph.ca" target="_blank"><span style="color:rgb(5,99,193)">lelio@uoguelph.ca</span></a><u></u><u></u></span></p>
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<p class="MsoNormal"><b>From:</b> Dave Goodwin <<a href="mailto:dave.goodwin@december.net" target="_blank">dave.goodwin@december.net</a>>
<br>
<b>Sent:</b> Friday, October 4, 2019 12:09 PM<br>
<b>To:</b> Lelio Fulgenzi <<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>><br>
<b>Cc:</b> cisco-voip voyp list <<a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a>><br>
<b>Subject:</b> Re: [cisco-voip] SIP Domain substitution<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:Tahoma,sans-serif">Are you wanting this to all happen within DNS instead of happening within a SIP UA? As far as I understand, if DNS redirected somewhere (SRV or CNAME record for example) it would not change the
destination URI the originator is trying to reach. The SIP protocol has redirection codes (such as 301 or 302) but whether or how you might be able to use them depends on the SIP UAs being used.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Tahoma,sans-serif">You might also be able to use something like a SIP normalization script (CUCM), SIP profiles (CUBE), or maybe search pattern replacements (Expressway) to just translate the domain as calls flow
in/out. I'm guessing what might be feasible without knowing more of the picture.<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Fri, Oct 4, 2019 at 11:10 AM Lelio Fulgenzi <<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Does SIP allow for domain name substitution? <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">By this I mean, instead of advertising or dialing <a href="mailto:coyote@phones.america.acmemanufacturing.com" target="_blank">
coyote@phones.america.acmemanufacturing.com</a> I want to use <a href="mailto:coyote@zing.com" target="_blank">
coyote@zing.com</a><u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">But I don’t want to have to reorganize and reprogram anything. <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-bottom:12pt">I just want the DNS to say, “hey, use this domain instead and try again.”<u></u><u></u></p>
<div id="gmail-m_-7733743004462058063gmail-m_-9160086299379446812AppleMailSignature">
<p class="MsoNormal"><i>-sent from mobile device-</i><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b>Lelio Fulgenzi, B.A.</b> | Senior Analyst<u></u><u></u></p>
<p class="MsoNormal">Computing and Communications Services | University of Guelph<u></u><u></u></p>
<p class="MsoNormal">Room 037 Animal Science & Nutrition Bldg | 50 Stone Rd E | Guelph, ON | N1G 2W1<u></u><u></u></p>
<p class="MsoNormal"><span style="color:black"><a href="tel:519-824-4120;56354" target="_blank">519-824-4120 Ext. 56354</a> | <a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a></span><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><span style="color:black"><a href="https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.uoguelph.ca%2Fccs&data=02%7C01%7C%7C9b720a4af69b41bebb5008d7493d7691%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637058400631439039&sdata=xk83CvE%2F9bV5TVtdcEAJ7jN5lrRb%2FU%2FHITHUgMV%2FpOQ%3D&reserved=0" originalsrc="http://www.uoguelph.ca/ccs" shash="YgVVkDXWs/wwzAZn4JSMr+N7E1qCaFncJlz0+/g143XbFE9xSDzjO6qIyE8EhYBF13zFzeFB+KmmT81WHX+mP/BQTd1cLCjjYYbGPzID5/OiSUvXJxttqskWXPrOvnu0m7s2WT6RNanhcmxqKTtVCqtrmLl0pzj9O0hC7krAs2k=" target="_blank">www.uoguelph.ca/ccs</a> |
@UofGCCS on Instagram, Twitter and Facebook</span><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><u></u><u></u></p>
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