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.
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:
UDP 500,4500, 5061
TCP 143, 443, 993 (some of these are for visual voicemail though)
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.
------ Original Message ------
From: "Chard, Alex" <[email protected]>
To: "[email protected]" <[email protected]>
Sent: 24/07/2022 5:19:26 PM
Subject: [AusNOG] Optus Wifi calling assistance
Hi Noggers,
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.
I have tried the normal customer support channels and they were
predictably useless.
Thanks,
Alex Chard
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