Voip and CiscoAnyConnect not working on TRB500

I recently purchased a TRB500 router and am impressed with build quality and the number of configuration options.
However, with its default factory set up I cannot get voip or the vpn gui I use - Ciso AnyConnect - to work.
With my voip phone (the model is Grandstream GRP2601P), I can make calls out, but incoming calls do not work.
It is configured with Siptalk, and the fact I can make calls out would suggest the account is configured correctly within the phone.
Cisco AnyConnect times out.

If I put the TRB500 into bridge mode and plug into the WAN port of my Optus Huawei B818-263 router/modem, voip and Cisco AnyConnect both work without any configuration changes.
I would like to remove the Optus device if possible.
I suspect that I may need to make some entries into port forwarding / traffic rules / nat rules.
It may be relevant that the url I am trying to connect to starts sslvpn…
If I put the url into a browser, a page does come up.
Any hints gratefully received.

Graham

Just in case this helps anybody, running the following solved my issues :

/etc/init.d/ipa disable
/etc/init.d/ipa stop

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