### Description
When using topos, Kamailio corrupts the Via header in the OK packet sent when
responding to an INVITE.
For example, the following is observed in the OK:
Via: SIP/2.0/UDP 1.2.3.4:5065;rport=5065;branch=abc,SIP/2.0/UDP
2.3.4.5:5060;branch=bcd
Expected behaviour is to correctly insert two separate Via headers, as in the
original INVITE:
Via: SIP/2.0/UDP 1.2.3.4:5065;rport=5065;branch=abc
Via: SIP/2.0/UDP 2.3.4.5:5060;branch=bcd
### Troubleshooting
When not loading topos.so, OK packet is passed as expected.
#### Reproduction
Place a call with a dialog where multiple Via headers are present with topos.so
loaded. Fully reproducible every time.
### Possible Solutions
topos.so should reconstruct the Via header properly by inserting a separate Via
header for each comma separated value it stores in the database.
### Additional Information
```
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 16:48:08 Jan 18 2017 with gcc 4.4.7
```
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https://github.com/kamailio/kamailio/issues/1005
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