[sr-dev] [kamailio/kamailio] rtpengine -> send_rtpp_command(): mismatched cookie in websocket response (#2862)

[marcinkowalczyk]

Hi Henning,

 After full night of production traffic I discovered this is not related to RTT, as happens to low-latency proxies too (~10ms no packet loss). 
Interesting part is that it hapens 99.9% in BYE so I think it may be related to rtpengine_delete() and fetching call stats like described in docs
```
5.5.  rtpengine_delete([flags])
Tears down the RTP proxy session for the current call. This populates the statistics pseudovariables (such “mos_min_pv” etc).
```

last night statistics - 83k calls:

```
root at kamailio5:~# grep -c 'ksr_lwsc_callback(): losing read buffer of 4096 bytes' /var/log/syslog
1433
root at kamailio5:~#
```

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