[sr-dev] [kamailio/kamailio] Support for 192.0.0.0/24 as NATed source (follow-up) (#2277)

[Sergiu Pojoga]

I lied.

In a dev environment using master branch, `c=` IP address is now fixed with `nat_addr_mode=1`

Also tested with `nat_addr_mode=0` and it does NOT change it, as expected.

Looks good to me!

kamailio -V
version: kamailio 5.4.0-dev4 (x86_64/linux) c68d78

Was able to test only in a 200 OK reply:
```
U 2020/04/16 20:40:45.214751 135.19.1.1:19748 -> 65.39.1.1:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 65.39.1.1;branch=z9hG4bK852b.2ac5eb86a9cb2654d292b458b696d7f8.0
Via: SIP/2.0/UDP 65.39.2.2:5060;rport=5060;branch=z9hG4bK3c0a4a1c
Record-Route: <sip:65.39.1.1;lr;did=a83.2a9>
From: <sip:18007777777 at client.mydomain.net>;tag=as57291cce
To: <sip:227 at 135.19.1.1:19748>;tag=224264919
Call-ID: 5788a5ee63e6e659248655176e70aad3 at client.mydomain.net
CSeq: 102 INVITE
Contact: <sip:227 at 192.0.0.254:11172>
Content-Type: application/sdp
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
User-Agent: Yealink SIP-T40G 76.84.0.10
Allow-Events: talk,hold,conference,refer,check-sync
Supported: timer
Content-Length: 320

v=0
o=- 20356 20356 IN IP4 192.168.0.84
s=SDP data
c=IN IP4 192.0.0.254
t=0 0
m=audio 10447 RTP/AVP 107 101
a=rtpmap:107 opus/48000/2
a=fmtp:107 sprop-maxcapturerate=16000; maxaveragebitrate=20000; maxplaybackrate=48000; useinbandfec=1
a=ptime:20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv


U 2020/04/16 20:40:45.221758 65.39.1.1:5060 -> 65.39.2.2:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 65.39.2.2:5060;rport=5060;branch=z9hG4bK3c0a4a1c
Record-Route: <sip:65.39.1.1;lr;did=a83.2a9>
From: <sip:18007777777 at client.mydomain.net>;tag=as57291cce
To: <sip:227 at 135.19.1.1:19748>;tag=224264919
Call-ID: 5788a5ee63e6e659248655176e70aad3 at client.mydomain.net
CSeq: 102 INVITE
Contact: <sip:227 at 192.0.0.254:11172;alias=135.19.1.1~19748~1>
Content-Type: application/sdp
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
Allow-Events: talk,hold,conference,refer,check-sync
Supported: timer
Content-Length: 416

v=0
o=- 20356 20356 IN IP4 135.19.1.1
s=SDP data
c=IN IP4 135.19.1.1
t=0 0
m=audio 10447 RTP/AVP 107 101
a=rtpmap:107 opus/48000/2
a=fmtp:107 sprop-maxcapturerate=16000; maxaveragebitrate=20000; maxplaybackrate=48000; useinbandfec=1
a=ptime:20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
a=direction:active
a=nortpproxy:yes
a=oldmediaip:192.0.0.254
a=oldmediaip:192.168.0.84
```



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