ChristianBergerSipgate created an issue (kamailio/kamailio#4281)
### Description
The rtpengine module uses a `cookie` field in the Protocol controlling
rtpengines. This field needs to be unique, and is derived from the `server_id`
field set in the Kamailio, the `pid` as well as the value of a variable
`myseqn`.
In many conditions, this is random enough. However particularly when using
docker, the `pid` will be identical across servers, reducing the randomness and
causing collisions.
### Expected behavior
The 34 bytes of the cookie should be as unique as possible.
#### Actual observed behavior
We get collisions many times per day, as different kamailio instances randomly
choose the same value.
### Possible Solutions
1. Set `myseqn` to a random value during module load.
2. Add an additional random value to the `gencookie` function.
3. Use `%x` instead of `%d` to squeeze more entropy into the 33 characters
available, and perhaps use fixed length fields.
The problem probably also exists in the following other modules:
1. rtpproxy
2. lrkproxy
We are not using those modules so we have not yet experienced collisions here.
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