SIPTrunk to Swyxware

hey…
I’m trying to connect a gentoo-hosted asterisk 1.2.27 test setup to a swyxware 6.12 server via sip-trunk to prepare for migration tests…

However - all i get out of it asterisk->swyx wise is “congestion” (“all lines busy now”) and the other way round i get a “busy” notice…

I created a SIP extension for swyx on asterisk which the server connects to and authenticates successfully (as seen in sip show peers), butthe trunk seems to be in mid-air (sip show registry reads “Auth. Sent”) … any suggestions?