[sr-dev] [kamailio/kamailio] incorrect ACK BYE packets routing with topoh enabled on kamailio 5.0.2 (#1165)

[Sergey Lavrov]

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### Description

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After upgrading kamailio from 4.4.5 to 5.0.2 ACK/BYE packets are routed incorrectly. Instead of routing from KAMAILIO INT IP to SIP UAC #2 ACK/BYE packets are routed from KAMAILIO EXT IP to KAMAILIO INT IP.
I attached two diagrams. First is from kamailio 4.4.5 with correct routing. Second is from kamailio 5.0.2 with wrong routing.
One of improtant notice is when topoh module is disabled ACK/BYE packets are routed correctly on kamailio 5.0.2.
Also in kamailio 5.0.2  DURI and RURI of ACK/BYE packets are populated not by Contact value of OK packet from SIP UA #2 but Record-Route value from OK packet. In kamailio 4.4.5 DURI is not populated at all and RURI is correct one.

### Troubleshooting

#### SIP Traffic

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SIP trace diagram from kamailio 4.4.5: http://imgur.com/5J95spW
SIP trace diagram from kamailio 5.0.2: http://imgur.com/TDOGdgA

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### Additional Information

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

```
version: kamailio 4.4.5 (x86_64/linux) f98162
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, 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_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: f98162 
compiled on 03:47:31 Feb 27 2017 with gcc 4.8.5
```

* **Operating System**:

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Kernel details (output of `uname -a`)
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```
Red Hat Enterprise Linux Server release 7.3 (Maipo)
Linux 2.6.32-042stab113.21 #1 SMP Wed Mar 23 11:05:25 MSK 2016 x86_64 x86_64 x86_64 GNU/Linux
```


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