[sr-dev] [kamailio/kamailio] HEPv3 packets stop tracing if Homer server goes down briefly (#2411)

[Luke Escudé]

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### Description

We send all traffic to a Homer (HEPv3) server for monitoring and SIP diagnostics, using the siptrace module. Config below:

modparam("siptrace", "duplicate_uri","sip:IP_ADDR:9060")
modparam("siptrace", "hep_mode_on",1)
modparam("siptrace", "trace_to_database",0)
modparam("siptrace", "trace_on", 1)
modparam("siptrace", "hep_version", 3)
modparam("siptrace", "trace_flag",22)
modparam("siptrace", "trace_mode", 1)

It works just fine of course, but the moment the Homer server goes down or needs to be rebooted, Kamailio doesn't seem to want to "reconnect" to the HEP server - It just stops reporting packets altogether. Kamailio requires a restart.

### Troubleshooting

#### Reproduction

Set up a Homer server with kamailio tracing HEP packets to it. Then, restart Homer. You will no longer receive packets, until the next time you restart Kamailio. 

We're using CentOS 7 x64 on all servers. There is no log information I can provide to assist with this.

Thanks!


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