[sr-dev] [kamailio/kamailio] v5.0.4: nathelper: force_socket not being honoured (#1298)

[00Asgaroth00]

Hi, I just set udp4_raw=0 on all 3 registrars and remove udpping_from_path from the settings, but the same behaviour persists.

registrar that processed the request (ping is successfull)
```
U 2017/11/03 13:28:33.770754 10.7.0.190:5060 -> 10.7.0.186:5062

OPTIONS sip:example_user at 212.2.172.228:39808;rinstance=ee53f90ba8a5d171;transport=UDP SIP/2.0.
Via: SIP/2.0/UDP 10.7.0.190:5060;branch=z9hG4bK2645058.
Route: <sip:10.7.0.186:5062;lr;received=sip:212.2.172.228:39808>.
From: sip:keepalive at example.com;tag=uloc-2-59fc6eab-1ce0-1-9968b2da-3f810117.
To: sip:example_user at 212.2.172.228:39808;rinstance=ee53f90ba8a5d171;transport=UDP.
Call-ID: 538b85e1-b0cecc34-ba1f4f1 at 10.7.0.190.
CSeq: 1 OPTIONS.
Content-Length: 0.
.


U 2017/11/03 13:28:33.810519 10.7.0.186:5062 -> 10.7.0.190:5060

SIP/2.0 200 OK.
Via: SIP/2.0/UDP 10.7.0.190:5060;rport=5060;branch=z9hG4bK2645058.
Record-Route: <sip:194.213.29.33:5062;r2=on;lr;ftag=uloc-2-59fc6eab-1ce0-1-9968b2da-3f810117>.
Record-Route: <sip:10.7.0.186:5062;r2=on;lr;ftag=uloc-2-59fc6eab-1ce0-1-9968b2da-3f810117>.
Contact: <sip:192.168.1.64:39808>.
To: <sip:example_user at 212.2.172.228:39808;rinstance=ee53f90ba8a5d171;transport=UDP>;tag=134de75f.
From: sip:keepalive at example.com;tag=uloc-2-59fc6eab-1ce0-1-9968b2da-3f810117.
Call-ID: 538b85e1-b0cecc34-ba1f4f1 at 10.7.0.190.
CSeq: 1 OPTIONS.
Accept: application/sdp, application/sdp.
Accept-Language: en.
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE.
Supported: replaces, norefersub, extended-refer, timer, outbound, path, X-cisco-serviceuri.
User-Agent: Z 3.15.40006 rv2.8.20.
Allow-Events: presence, kpml, talk.
Content-Length: 0.
.
```

1st registrar replicated to (tries to ping, but wrong interface)
```
U 2017/11/03 13:28:49.675297 10.6.0.189:5060 -> 10.7.0.186:5062

OPTIONS sip:example_user at 212.2.172.228:39808;rinstance=ee53f90ba8a5d171;transport=UDP SIP/2.0.
Via: SIP/2.0/UDP 10.6.0.189:5060;branch=z9hG4bK2611596.
Route: <sip:10.7.0.186:5062;lr;received=sip:212.2.172.228:39808>.
From: sip:keepalive at example.com;tag=uloc-2-59fc6eab-1ce0-1-9968b2da-d35cdfe1.
To: sip:example_user at 212.2.172.228:39808;rinstance=ee53f90ba8a5d171;transport=UDP.
Call-ID: dd9e8af5-a56efaa6-913d294 at 10.6.0.189.
CSeq: 1 OPTIONS.
Content-Length: 0.
.
```

2nd registrar replicated to (tries to ping, but wrong interface)
```
U 2017/11/03 13:27:37.204775 10.6.0.191:5060 -> 10.7.0.186:5062

OPTIONS sip:example_user at 212.2.172.228:39808;rinstance=ee53f90ba8a5d171;transport=UDP SIP/2.0.
Via: SIP/2.0/UDP 10.6.0.191:5060;branch=z9hG4bK4520144.
Route: <sip:10.7.0.186:5062;lr;received=sip:212.2.172.228:39808>.
From: sip:keepalive at example.com;tag=uloc-2-59fc6eab-1ce0-1-9968b2da-1052c4a3.
To: sip:example_user at 212.2.172.228:39808;rinstance=ee53f90ba8a5d171;transport=UDP.
Call-ID: ca2e8ec2-db7eb9a-63a17d6 at 10.6.0.191.
CSeq: 1 OPTIONS.
Content-Length: 0.
.
```

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