You have to set `h_id_start` and `h_id_step` for all servers in the replication group so
the generated ids do not overlap:
*
https://www.kamailio.org/docs/modules/stable/modules/dialog.html#dialog.p.h…
Likely the issue was caused by matching a dialog with same `h_id`, which was generated by
a different server and not in the state that was the corresponding dialog for the
processed sip message.
Eventually you can also set `dlg_match_mode=2`.
I will also add checks for the socket str, in case of replication might be safer.
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