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According to RFC 2782 (<a href="https://www.ietf.org/rfc/rfc2782.txt">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 <bmeade90@vt.edu> 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>
<p class="MsoNormal"><u></u> <u></u></p>
<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>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<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>
<p class="MsoNormal"><span style="font-family:Arial,sans-serif">Room 037 Animal Science & Nutrition Bldg | 50 Stone Rd E | Guelph, ON | N1G 2W1<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:Arial,sans-serif">519-824-4120 Ext. 56354 |
<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>
<p class="MsoNormal"><span style="font-family:Arial,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><a href="https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.uoguelph.ca%2Fccs&data=02%7C01%7C%7C8490bfb695e94274db6d08d7491ffa5a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637058274001777004&sdata=fJmvYYvsCfltrkYHNlnHpEd8QNGDI%2BZpiDqnHY0p5uU%3D&reserved=0" originalsrc="http://www.uoguelph.ca/ccs" shash="O94WYzxEDCpiUAdludifQdxgIUNLZNE/GXDEcLMW43cSyj0yEH94Urm8ixCU5E89OYNuzIiSXMnnSXtF5p4hrNaeUs32pvffFd64w1HP/C8UN4/EUvyH4QipxL3/lKdeBeQgAljKuzC285y0k/3lYNqe4A4rT+qCIVBlbcrwxo8=" target="_blank"><span style="font-family:Arial,sans-serif">www.uoguelph.ca/ccs</span></a><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)">
| @UofGCCS on Instagram, Twitter and Facebook<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b>From:</b> Dave Goodwin <<a href="mailto:dave.goodwin@december.net" target="_blank">dave.goodwin@december.net</a>>
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<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>
<p class="MsoNormal"><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"><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>
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<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>
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