[sr-dev] [kamailio/kamailio] 180 Ringing without Contact with TOPOS enabled (#1720)

[Sergey Basov]

Just trued with latest commit:
```
SIP/2.0 180 Ringing 
From: <sip:1111 at 1.2.3.4>;tag=08001964526856 
To: <sip:sip:2222 at 5.6.7.8>;tag=vy~HzZJ 
Call-ID: vqeU544121321136bcGhEfCjEbh
CSeq: 672321 INVITE 
Content-Length: 0 
Via: SIP/2.0/UDP KITS1.MSS.LIFE.COM:5060;rport=5060;received=10.56.63.10;branch=z9hG4bK00000017483123160717 
Record-Route: <sip:KITS1.MSS.LIFE.COM:5060;transport=UDP;lr>
```

Ericsson still terminate with a BYE

```
BYE sip:sip:2222 at 5.6.7.8 SIP/2.0 
From: <sip:1111 at 1.2.3.4>;tag=08001964526856 
To: <sip:sip:2222 at 5.6.7.8>;tag=vy~HzZJ 
Max-Forwards: 70 
Via: SIP/2.0/UDP KITS1.MSS.LIFE.COM:5060;branch=z9hG4bK00000017580316458612 
Call-ID: vqeU544121321136bcGhEfCjEbh 
CSeq: 672322 BYE 
Reason: Q.850;cause=16 
Content-Length: 0
```

And now kamailio responce to BYE from A side with "404 not here"
```
SIP/2.0 404 Not here 
From: <sip:1111 at 1.2.3.4>;tag=08001964526856 
To: <sip:sip:2222 at 5.6.7.8>;tag=vy~HzZJ 
Via: SIP/2.0/UDP KITS1.MSS.LIFE.COM:5060;branch=z9hG4bK00000017580316458612;rport=5060;received=10.56.63.10 
Call-ID: vqeU544121321136bcGhEfCjEbh
CSeq: 672322 BYE 
Content-Length: 0 
```

Seems it fails in check "if (loose_route())"


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