[sr-dev] [kamailio/kamailio] Topos - Via Restore (#1865)

[nicoonline]

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### Description
Topos don't restore the via on the correct position towards the caller.
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Explain what you did, what you expected to happen, and what actually happened.
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### Troubleshooting

#### Reproduction

SIP/2.0 200 OK.
From: "N" <sip:+111111111 at proxy1>;tag=as68c113e4.
To: <sip:0000000 at proxy1>;tag=DHpXgm46a8QgQ.
Call-ID: 09e5173225bed77e5cd7247550ee5b60
CSeq: 104 BYE.
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY.
Supported: path, replaces.
Content-Length: 0.
Via: SIP/2.0/UDP IP:10060;rport=10060;branch=z9hG4bK7e7ab41c.
Contact: <sip:atpsh-5c710f13-962-c at IP>.


Should be 

SIP/2.0 200 OK.
Via: SIP/2.0/UDP IP:10060;rport=10060;branch=z9hG4bK7e7ab41c.
From: "N" <sip:+111111111 at proxy1>;tag=as68c113e4.
To: <sip:0000000 at proxy1>;tag=DHpXgm46a8QgQ.
Call-ID: 09e5173225bed77e5cd7247550ee5b60
CSeq: 104 BYE.
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY.
Supported: path, replaces.
Content-Length: 0.
Contact: <sip:atpsh-5c710f13-962-c at IP>.



### Additional Information

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

version: kamailio 5.1.7 (x86_64/linux) 567df3
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: 567df3 
compiled on 07:05:54 Feb 21 2019 with gcc 4.4.7


```
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```

* **Operating System**:

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Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
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```
(paste your output here)
```


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