[AusNOG] Optus Wifi calling assistance

[Chard, Alex]

Alastair and Joseph,
Thank you both for your input.. having taken both approaches and confirming that no traffic outbound is being blocked, it seems Optus are blocking the connections as part of their “We don’t support VPNs” policy – no doubt this is to protect their international roaming revenue (our corporate traffic egresses via Google Cloud so looks like/is a VPN of sorts).

Appreciate the assistance all the same. As I cant get a sensible answer from Optus themselves I’ll advise our affected employees to move carriers. Telstra Wifi calling works a treat!

Regards,
Alex Chard

From: Alastair Watts <awatts at pett.com.au>
Sent: Sunday, 24 July 2022 17:33
To: Chard, Alex <Alex.Chard at origin.com.au>
Cc: ausnog at ausnog.net
Subject: Re: [AusNOG] Optus Wifi calling assistance

Hi Alex,

WiFi Calling establishes an IPSec tunnel back to the mobile network, using a destination hostname based on the mobile country code and mobile network code under the 3gppnetwork.org<http://3gppnetwork.org> domain.

So permitting UDP 500 and 4500, and IP Protocol 50 (if possible) should cover it, in addition to making sure resolution within the above domain is permitted.

Cheers,

Al


On 24 Jul 2022, at 16:49, Chard, Alex <Alex.Chard at origin.com.au<mailto:Alex.Chard at origin.com.au>> wrote:

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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