### Description
Different behaviour of rtpengine_manage depending on where it is called
1. Response 180 **is not** sent to rtpengine :12221 using only reply_route
1. Response 180 **is sent** to rtpengine :12221 using
`onreply_route[MANAGE_REPLY]`
Scenario 1 - reply_route only
- call rtpenginge_manage() in reply_route for responses
- works for 200 OK
- for 180 Ringing, the command does not appear on the wire to rtpengine :12221
Scenario 2 - reply_route is empty, use `onreply_route[MANAGE_REPLY]`
- call rtpenginge_manage() in `onreply_route[MANAGE_REPLY]`
- works for 200 OK
- for 180 Ringing, the command appears on the wire to rtpengine :12221, and SDP
is injected
### Troubleshooting
#### Reproduction
1. Confirmed that setup is working without `onreply_route[MANAGE_REPLY]`
2. Caller does not see any SDP inside 180 response; this means that
rtpengine_manage decided not to end anything to rtpengine :12221
3. Move call to `rtpengine_manage()` inside `onreply_route[MANAGE_REPLAY]`
4. Now observe that SDP appears inside 180 response, indicating that
rtpengine_manage decided that it should send the "offer" command to rtpengine
:12221
#### Debugging Data
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https://github.com/kamailio/kamailio/issues/2577
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