I wonder if this is related to my issue with DTMF strings longer that six characters? I can also join 4 char nodes, but 5 character and longer fail. Are you seeing anything in /var/log/asterisk/messages? "Exceptionally long voice queue length" during DTMF
Sounds like the same symptoms. I can link nodes with Allmon3 no matter the length, I’m betting the node lookup tool will all work. It’s only when using DTMF longer than 6 chars. That’s when the queue backs up on the channel the DTMF came in on.