After a bit mor testing of t_replicate_udp I am sorry to say that we still have a problem with that. Firewall is open. We see the same locked transactions and replication has stopped, the other side has an empty usrloc. Kamailio from the 5.0 branch of git before the 5.0.3 release.
Version:

# kamailio -v
version: kamailio 5.0.2 (x86_64/linux) 

# kamcmd tm.stats
{
	current: 19974
	waiting: 19974
	total: 534594
	total_local: 0
	rpl_received: 544239
	rpl_generated: 577
	rpl_sent: 534606
	6xx: 0
	5xx: 4533
	4xx: 584
	3xx: 0
	2xx: 529484
	created: 534594
	freed: 514619
	delayed_free: 0
}

One server replicating with udp, the other with tcp. I see TCP keepalives flowing, so no blocking any more.

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