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### Description
I have 2 jsonrpc servers configured with different prio's. For testing, I have
the servers configured to always delay the response to any request by more than
the module's timout setting.
The (initial) request is sent to the first server. As this one times out, I
would expect a retry to go to the second servers, but instead, all retries are
sent to the same server. The backup server is never contacted. This makes the
whole "prio" system seem a bit useless.
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Explain what you did, what you expected to happen, and what actually happened.
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### Troubleshooting
#### Reproduction
```
modparam("janssonrpcc", "server",
"conn=test;addr=pc1;port=8081;priority=5;weight=10")
modparam("janssonrpcc", "server",
"conn=test;addr=pc1;port=8082;priority=5;weight=10")
```
```
janssonrpc_request("test", "Test.Timeout", '[ { "Timout": 1000} ]',
"route=JSONRPC_RESPONSE;retry=10;timeout=1000");
```
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#### Log Messages
No useful logs are produced. I verified the described behavior on the jsonrpc
server.
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Kamailio, add them next, or attach to issue, or provide a link to download them
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```
2023-02-23T16:59:34.585346+01:00 pc1 proxy1[340870]: INFO: janssonrpcc
[janssonrpc_connect.c:361]: bev_connect(): Connecting to server pc1:8081 for
conn rating.
2023-02-23T16:59:34.585420+01:00 pc1 proxy1[340870]: INFO: janssonrpcc
[janssonrpc_connect.c:361]: bev_connect(): Connecting to server pc1:8082 for
conn rating.
2023-02-23T16:59:34.585446+01:00 pc1 proxy1[340870]: INFO: janssonrpcc
[janssonrpc_connect.c:290]: bev_connect_cb(): Connected to host pc1:8081
2023-02-23T16:59:34.585462+01:00 pc1 proxy1[340870]: INFO: janssonrpcc
[janssonrpc_connect.c:290]: bev_connect_cb(): Connected to host pc1:8082
2023-02-23T17:05:10.903398+01:00 pc1 proxy1[340870]: WARNING: janssonrpcc
[janssonrpc_request.c:247]: schedule_retry(): Number of retries exceeded.
Failing request.
```
### Possible Solutions
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If you found a solution or workaround for the issue, describe it. Ideally,
provide a pull request with a fix.
-->
Retry in combination with a timeout and prio's is a bit tricky. When do what?
Just retrying on the first prio makes the lower prio servers completely
useless, while going to the next prio on every retry skips possibly useful
high-prio servers and may exhaust the number of candidate servers very fast.
Best solution IMHO would be to first try every server in the highest prio,
before going to the next prio. Do not do (exponential) backoff between these
steps.
If there are still retries remaining after that, wrap around to the highest
prio with the exponentional backoff delay.
With the above, failover considers all servers and failover between servers is
fast while not overloading a single server.
BTW. If I configure multiple servers per prio, it seems to randomly select one
of them for every (re)try. It never selects one form the next prio.
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
5.6.1
```
* **Operating System**:
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16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
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```
(paste your output here)
```
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