After fixing the firewall we still have issues. I see the TCP keepalives coming, but
replication stopped, no SIP messages flowing and tm.stats has a big pile of open
transactions, no more shm memory available.
Current and waiting seems to follow each other. No calls during the night, so this is only
registrations. 300 devices connected. I will have to go back to replication over UDP or
stateless replication using forward to get stability.
```
# kamcmd tm.stats
{
current: 19965
waiting: 19965
total: 42187
total_local: 0
rpl_received: 42207
rpl_generated: 10
rpl_sent: 42211
6xx: 0
5xx: 1
4xx: 4
3xx: 0
2xx: 42191
created: 42187
freed: 22221
delayed_free: 0
}
```
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