[sr-dev] [kamailio/kamailio] Phonenum module not working when invoked from other than cfg file (#2052)

[balajeesv]

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### Description
 I have kamailio.cfg file for configuration and Lua files for processing messages. What I observed is PHONUM module is not initialized during startup. And when using phonenum module it fails. I am invoking phonenum module in lua with "KSR.phonenum.match". This is in continuation to issue [1883](https://github.com/kamailio/kamailio/issues/1883), which i cannot reopen.Please check this and let me know any further logs required.
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### Troubleshooting

#### Reproduction
1. cfg file only have configuration 
2. Invoke phonemun module through KEMI "KSR.phonenum.match" in other file
3. Test to validate phonenum

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#### Debugging Data

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#### Log Messages

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```
Aug 29 08:33:27 ip-10-130-74-105 /usr/local/sbin/kamailio[2157]: DEBUG: app_lua [app_lua_sr.c:1655]: sr_kemi_lua_exec_func_ex(): param[0] for: isflagset is int: 1
Aug 29 08:33:27 ip-10-130-74-105 /usr/local/sbin/kamailio[2157]: DEBUG: app_lua [app_lua_sr.c:1651]: sr_kemi_lua_exec_func_ex(): param[0] for: match is str: +919876543210
Aug 29 08:33:27 ip-10-130-74-105 /usr/local/sbin/kamailio[2157]: DEBUG: app_lua [app_lua_sr.c:1651]: sr_kemi_lua_exec_func_ex(): param[1] for: match is str: src
Aug 29 08:33:27 ip-10-130-74-105 /usr/local/sbin/kamailio[2157]: DEBUG: phonenum [phonenum_pv.c:312]: phonenum_update_pv(): container not found: +919876543210
Aug 29 08:33:27 ip-10-130-74-105 /usr/local/sbin/kamailio[2157]: DEBUG: app_lua [app_lua_sr.c:934]: lua_sr_pv_get_val(): pv get: $rc
Aug 29 08:33:27 ip-10-130-74-105 /usr/local/sbin/kamailio[2157]: DEBUG: [core/pvapi.c:371]: pv_cache_add(): pvar [$rc] added in cache
Aug 29 08:33:27 ip-10-130-74-105 /usr/local/sbin/kamailio[2157]: DEBUG: app_lua [app_lua_sr.c:934]: lua_sr_pv_get_val(): pv get: $phn(src=>valid)
Aug 29 08:33:27 ip-10-130-74-105 /usr/local/sbin/kamailio[2157]: DEBUG: phonenum [phonenum_pv.c:162]: pv_parse_phonenum_name(): phonenum [src] - key [valid]
```

#### SIP Traffic

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### Possible Solutions
In kamailio.cfg if I add some dummy route(as below) then Phonenum module is initialized and it is working as expected.
route[PHONENUM] {
if($phn(src=>valid)==1) {
xlog("dummy route\n");
}
}
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### Additional Information

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

```
(paste your output here)
```

* **Operating System**:

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