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### Description
Follow-up to previous closed PR https://github.com/kamailio/kamailio/pull/1488
Had a chance to catch a live call involving rfc7335 private IPs.
It seems like either nat_uac_test() or more likely fix_nated_sdp() doesn't
catch the 192.0.0.0/29 subnet as private.
### Troubleshooting
#### Reproduction
route[NATMANAGE] {
...
if (nat_uac_test("8"))
fix_nated_sdp("15");
...
}
#### Debugging Data
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bt full
info locals
list
If you are familiar with gdb, feel free to attach more of what you consider to
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```
(paste your debugging data here)
```
#### Log Messages
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Check the syslog file and if there are relevant log messages printed by
Kamailio, add them next, or attach to issue, or provide a link to download them
(e.g., to a pastebin site).
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```
(paste your log messages here)
```
#### SIP Traffic
<!--
If the issue is exposed by processing specific SIP messages, grab them with
ngrep or save in a pcap file, then add them next, or attach to issue, or
provide a link to download them (e.g., to a pastebin site).
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```
U 2020/04/07 10:36:02.572802 135.19.155.163:17669 -> 65.39.1.1:5060
INVITE sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 192.0.0.254:11198;branch=z9hG4bK1066155396
From: "ME" sip:[email protected]:5060;tag=3901872054
To: sip:[email protected]:5060
Call-ID: [email protected]
CSeq: 1 INVITE
Contact: sip:[email protected]:11198
Content-Type: application/sdp
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER,
SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
Max-Forwards: 70
User-Agent: Yealink SIP-T46S 66.84.0.10
Allow-Events: talk,hold,conference,refer,check-sync
Supported: replaces
Content-Length: 305
v=0
o=- 22668 22668 IN IP4 192.168.0.78
s=SDP data
c=IN IP4 192.0.0.254
t=0 0
m=audio 22936 RTP/AVP 9 0 8 18 101
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=ptime:20
a=sendrecv
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
U 2020/04/07 10:36:02.573384 65.39.1.1:5060 -> 135.19.155.163:17669
SIP/2.0 100 Trying
Via: SIP/2.0/UDP
192.0.0.254:11198;branch=z9hG4bK1066155396;rport=17669;received=135.19.155.163
From: "ME" sip:[email protected]:5060;tag=3901872054
To: sip:[email protected]:5060
Call-ID: [email protected]
CSeq: 1 INVITE
Server: NXO
Content-Length: 0
U 2020/04/07 10:36:02.573608 65.39.1.1:5060 -> 66.199.2.2:5060
INVITE sip:[email protected]:5060 SIP/2.0
Record-Route: sip:65.39.1.1;lr;did=faf.517
Via: SIP/2.0/UDP 65.39.1.1;branch=z9hG4bK6ef8.b9248afe5375fc379eb33718de1f7481.0
Via: SIP/2.0/UDP
192.0.0.254:11198;rport=17669;received=135.19.155.163;branch=z9hG4bK1066155396
From: "ME" sip:[email protected]:5060;tag=3901872054
To: sip:[email protected]:5060
Call-ID: [email protected]
CSeq: 1 INVITE
Contact: sip:[email protected]:11198;alias=135.19.155.163~17669~1
Content-Type: application/sdp
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER,
SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
Max-Forwards: 69
Allow-Events: talk,hold,conference,refer,check-sync
Supported: replaces
Content-Length: 281
..
v=0.
o=- 22668 22668 IN IP4 192.168.0.78
s=SDP data.
c=IN IP4 192.0.0.254
t=0 0
m=audio 22936 RTP/AVP 9 0 18 101
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=ptime:20
a=sendrecv
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
```
### 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 fix.
-->
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.1.10 (x86_64/linux) cfcfd5
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS,
DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC,
F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT,
USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144 MAX_URI_SIZE 1024,
BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: cfcfd5
compiled on 21:57:38 Feb 12 2020 with gcc 4.9.2
```
* **Operating System**:
<!--
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16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
-->
```
Debian 8
Linux proxy1 2.6.32-39-pve #1 SMP Fri May 8 11:27:35 CEST 2015 x86_64 GNU/Linux
```
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