IAX2 trunks and Asterisk16?

Are there any known issues with iax2 trunks and asterisk 16? I have two systems connected via iax2 trunks using setup I’ve successfully followed numerous times. This time however when system 1 dials out I’m getting -

1316	[2022-02-14 08:26:21] VERBOSE[6099][C-0000003a] app_dial.c: Called IAX2/ToStackrow/2599	
1317	[2022-02-14 08:26:21] VERBOSE[6099][C-0000003a] chan_iax2.c: Hungup 'IAX2/ToStackrow-8437'	
1318	[2022-02-14 08:26:21] VERBOSE[6099][C-0000003a] app_dial.c: Everyone is busy/congested at this time (1:0/0/1)	
1319	[2022-02-14 08:26:21] VERBOSE[6099][C-0000003a] pbx.c: Executing [s@macro-dialout-trunk:35] NoOp("PJSIP/2410-00000036", "Dial failed for some reason with DIALSTATUS = CHANUNAVAIL and HANGUPCAUSE = 58") in new stack	
1320	[2022-02-14 08:26:21] VERBOSE[6099][C-0000003a] pbx.c: Executing [s@macro-dialout-trunk:36] GotoIf("PJSIP/2410-00000036", "0?continue,1:s-CHANUNAVAIL,1") in new stack	
1321	[2022-02-14 08:26:21] VERBOSE[6099][C-0000003a] pbx_builtins.c: Goto (macro-dialout-trunk,s-CHANUNAVAIL,1)	
1322	[2022-02-14 08:26:21] VERBOSE[6099][C-0000003a] pbx.c: Executing [s-CHANUNAVAIL@macro-dialout-trunk:1] Set("PJSIP/2410-00000036", "RC=58") in new stack	
1323	[2022-02-14 08:26:21] VERBOSE[6099][C-0000003a] pbx.c: Executing [s-CHANUNAVAIL@macro-dialout-trunk:2] Goto("PJSIP/2410-00000036", "58,1") in new stack

The system is using the correct outbound route with the correct trunk. No sign of the call getting to system 2 using sngrep to watch for traffic. Any thoughts?

After running a packet capture it appears that call does go to system 2 but system 2 rejects the call. I found the rejection packet and the following:

image

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