[sr-dev] [kamailio/kamailio] how to choose 2 different rr heads (#2861)

[hance2010]

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### Description

how to choose 2 different rr heads when relay a public call to lan? Thanks!

### Expected behavior

#### Actual observed behavior

#### Debugging Data

```
(paste your debugging data here)
```

#### Log Messages

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```
(paste your log messages here)
```

#### SIP Traffic

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### Possible Solutions

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If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a improvement.
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### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
kamailio 5.5.1
```

* **Operating System**:


<!--
Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
-->

```
debian10
```


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