### Description
When kamailio need to pass call from carrier to customer VoIP PBX in docker
container on swarm cluster then it not possible.
Network interconnection.
In docker environment eth1 NIC of kamailio and VoIP PBX connected to internet
via iptables masquerading. eth1 NIC of kamailio and VoIP PBX have random IP
address and generally no way to pass message between kamailio and VoIP PBX via
eth1 NIC.
Also both containers have eth0 NIC in same network with static IP. But network
on eth0 NIC not connected to Internet.
SIP signaling is passed like
eth1-Kamailio-eth0 <-> eth0-VoIP PBX
In this network kamailio add/removes two Record-Route. For ACK message with
two `Route` headers this rule does not work. Each `Route` headers for same
kamailio instance and must be translated by one loose_route call
```
The proxy will inspect the URI in the topmost Route header
field value. If it indicates this proxy, the proxy removes it
from the Route header field (this route node has been
reached).
```
Really `Route` headers translated separately and second `loose_route` cannot be
completed. Details in `details.txt`
[details.txt](https://github.com/kamailio/kamailio/files/1220872/details.txt)
Wireshark pcap file and kamailio log with enabled debug attached of similar
calls is attached.
[full-call.zip](https://github.com/kamailio/kamailio/files/1220875/full-call.zip)
#### Reproduction
Create config when kamailio add two `Record-Route` headers and send ACK with
two `Route` headers
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