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<body><div>You could go the net-eng route, give a phone some open access and capture its traffic to suss what it may be doing to complete a wifi call.</div><div><br /></div><div>In general though, although it may be that different carriers do it slightly different - wifi calling appears to happen over IPSec tunnels, and maybe encrypted SIP, so many commonalities across the board appear to be:<br /><br />UDP 500,4500, 5061<br />TCP 143, 443, 993 (some of these are for visual voicemail though)</div><div><br /></div><div>You might be able to get it working with a combo of this, its worth a shot, but if no luck would definitely require specifics from Optus or someone who's gone through it before.</div>
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<div>------ Original Message ------</div>
<div>From: "Chard, Alex" <<a href="mailto:Alex.Chard@origin.com.au">Alex.Chard@origin.com.au</a>></div>
<div>To: "<a href="mailto:ausnog@ausnog.net">ausnog@ausnog.net</a>" <<a href="mailto:ausnog@ausnog.net">ausnog@ausnog.net</a>></div>
<div>Sent: 24/07/2022 5:19:26 PM</div>
<div>Subject: [AusNOG] Optus Wifi calling assistance</div><div><br /></div>
<div id="xfb16ac64fe4f49f" style="word-wrap:break-word"><blockquote cite="MEYPR01MB73194D4B6A98A31B6AB25656D9929@meypr01mb7319.ausprd01.prod.outlook.com" type="cite" class="cite2">
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<p class="MsoNormal">Hi Noggers,<o:p xmlns:o="#unknown"></o:p></p>
<p class="MsoNormal">I’m looking for a contact at Optus (or not at Optus maybe?) who would be able to advise what we need to permit on our firewalls to get Wifi Calling working on the Optus network.<o:p xmlns:o="#unknown"></o:p></p>
<p class="MsoNormal">I have tried the normal customer support channels and they were predictably useless.<o:p xmlns:o="#unknown"></o:p></p>
<p class="MsoNormal"><o:p xmlns:o="#unknown"> </o:p></p>
<p class="MsoNormal">Thanks,<o:p xmlns:o="#unknown"></o:p></p>
<p class="MsoNormal">Alex Chard<o:p xmlns:o="#unknown"></o:p></p>
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