Yeastar TB400 gateway as Freepbx entension(s)

For some time now, i have had a Sangoma Vega 60G Gateway 4 BRI connected to a Panasonic Ns1000 (via BRI) for outgoing calls via a cloud freepbx, connecting to extension numbers 2001-2008.
This worked fine apart from one or two BRI’s going off-line from time to time (but i would reset remotley). However last week the whole BRI interface (all 4 ports) stopped responding. So ordered a new one from Voipon, who emailed me 2 hours later to say it wasn’t actually in stock…
So i ordered a Yeastar TB400 - spent hours, IP trunk shows registered but all cals fail as BUSY.
Any help would be appreciated.

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