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_id_start

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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