And indeed, after looking further into this direction, helped also by your troubleshooting
findings posted in an comment above, the processing of cseq update for dmq was leading to
the deadlock.
The commit I pushed yesterday (which was backported to 5.4 and 5.3 branches as well)
should fix it. Can you try with it and `track_cseq_updates`set back to 1?
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