[kamailio/kamailio] The I-CSCF does not send Ringing under heavy load. (Issue #3071) - sr-dev

5 Apr 2022

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### Description

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I set up Kamailio IMS , in the end everything turned out great, calls are made, and I
decided to check how Kamailio copes with the load. I am creating load using sipp
application. There is no problem with a low call generation rate, but if you raise the
call generation to more than 20 calls per second, some of the calls fail.
### Troubleshooting
Challenges are always dropped sequentially
![image](https://user-images.githubusercontent.com/92918808/161745286-264d6e9b-47bb-4fcb-923a-1f5ded4cd999.png)
I compared the calls and saw that the ICSCF does not send a 180 Ringing message towards
the SCSCF.
![image](https://user-images.githubusercontent.com/92918808/161745354-2f97f8d1-2eb4-4a53-a9b0-2cb9d9d536d6.png)
Below is an example of a successful call.
![image](https://user-images.githubusercontent.com/92918808/161745412-20f0ecc6-3952-4e01-9c74-4f6fa6cfd3c8.png)

CPU, MEM indicators are normal. I increased the shr_mem and pkg_mem parameters. 
S-CSCF and I-CSCF communicate over UDP, but reside on the same server. It doesn't look
like the packets are dropping or suffering from collisions.
10.21.4.226 external IP P-CSCF
10.10.0.1 IP P-CSCF
10.10.0.2 IP S/I-CSCF
#### Reproduction

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Using the sipp application, generate 100 calls at a generation rate greater than 20 calls
per second.
#### Debugging Data

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```
none
```

#### Log Messages

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```
attached below
```
[logs.zip](https://github.com/kamailio/kamailio/files/8417659/logs.zip)

#### SIP Traffic

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in a pcap file, then add them next, or attach to issue, or provide a link to download them
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```
attached below

```
[call_rejected.zip](https://github.com/kamailio/kamailio/files/8417640/call_…

### Possible Solutions

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### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
version: kamailio 5.3.2 (x86_64/linux) 42be5d
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST,
DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY,
USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR,
USE_DST_BLACKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535,
DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 42be5d 
compiled on 10:39:53 Dec 27 2021 with gcc 9.3.0
```

* **Operating System**:

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```
Ubuntu 20.04.3 LTS Linux ims-core 5.4.0-104-generic #118-Ubuntu SMP Wed Mar 2 19:02:41 UTC
2022 x86_64 x86_64 x86_64 GNU/Linux

```

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