[sr-dev] [kamailio/kamailio] Kamailio 5.3 app_ruby crashed with example config (#2180)

[Daniel-Constantin Mierla]

It seems to be related to the functions exported via KEMI that return string value. I looked at the code, but I could not find a reason for it.

The next ruby line is executing ok:

```
 KSR.err("RUBY - #{KSR.is_INVITE} - #{KSR::PV.get('$pp')}\n")
```

$pp returns the process id, which is int.

Next one causes a crash:

```
  KSR.err("RUBY - #{KSR.is_INVITE} - #{KSR::PV.get('$si')}\n")
```

$si returns source ip as a string.

I am not familiar with Ruby, I did the embedding of Ruby following some online examples. Maybe other people familiar with Ruby ecosystem can provide some hints.

If it cannot be sorted out, I can add again the code for dealing with PVs from v5.3, however, in that case there will still be some functions that won't work, like those exposed by kemix module.


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