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### Description

I use kamilio to deploy as P-cscf, I-cscf,S-cscf to implement IMS functions, two test phones attach kamilio and make volte call. The P-cscf will exit every time.

### Troubleshooting

I think it may related to the collaboration between tm module and ipsec module.

#### Reproduction I set up a test environment according to the instructions https://open5gs.org/open5gs/docs/tutorial/02-VoLTE-setup/ . two iphones connetc to the EPC and attach to kamailio,and the IPSec is available.

#### Debugging Data Here is the gdb info ``` Reading symbols from /usr/local/sbin/kamailio...done. [New LWP 22934] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `/usr/local/sbin/kamailio -f /etc/kamailio_pcscf/kamailio_pcscf.cfg -P /var/run/'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f1f4951f2d0 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) bt #0 0x00007f1f4951f2d0 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007f1f494cefb4 in vfprintf () from /lib/x86_64-linux-gnu/libc.so.6 #2 0x00007f1f494d1370 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #3 0x00007f1f494ce7ea in vfprintf () from /lib/x86_64-linux-gnu/libc.so.6 #4 0x00007f1f494d78c4 in fprintf () from /lib/x86_64-linux-gnu/libc.so.6 #5 0x00007f1f44290629 in fill_contact (ci=0x7fff6d0ae1a0, m=0x7f1f48ee3280) at cmd.c:218 #6 0x00007f1f4429a29a in ipsec_forward (m=0x7f1f48ee3280, d=0x7f1f44a7efb8) at cmd.c:693 #7 0x00007f1f442890ac in w_forward (_m=0x7f1f48ee3280, _d=0x7f1f44a7efb8 "\270\356\247D\037\177", _cflags=0x0) at ims_ipsec_pcscf_mod.c:355 #8 0x000055713f26f2f1 in do_action (h=0x7fff6d0af080, a=0x7f1f48e7d3d8, msg=0x7f1f48ee3280) at core/action.c:1079 #9 0x000055713f27d2ab in run_actions (h=0x7fff6d0af080, a=0x7f1f48e79710, msg=0x7f1f48ee3280) at core/action.c:1578 #10 0x000055713f27dabd in run_top_route (a=0x7f1f48e79710, msg=0x7f1f48ee3280, c=0x7fff6d0af080) at core/action.c:1663 #11 0x00007f1f489dd18a in reply_received (p_msg=0x7f1f48ee3280) at t_reply.c:2418 #12 0x000055713f382183 in do_forward_reply (msg=0x7f1f48ee3280, mode=0) at core/forward.c:745 #13 0x000055713f383fcb in forward_reply (msg=0x7f1f48ee3280) at core/forward.c:846 #14 0x000055713f3e82a9 in receive_msg ( buf=0x55713f6c9ea0 <buf> "SIP/2.0 183 Session Progress\r\nRecord-Route: sip:mt@192.168.4.207;transport=tcp;r2=on;lr=on;ftag=2573636716;rm=7;did=a1e.1e8,sip:mt@192.168.4.207;r2=on;lr=on;ftag=2573636716;rm=7;did=a1e.1e8,<sip:m"..., len=1958, rcv_info=0x7fff6d0af5c0) at core/receive.c:510 #15 0x000055713f2d05e1 in udp_rcv_loop () at core/udp_server.c:548 #16 0x000055713f233c1e in main_loop () at main.c:1673 #17 0x000055713f23cff2 in main (argc=13, argv=0x7fff6d0afea8) at main.c:2802

```

#### Log Messages Here is the P-cscf logs [pcscf.log](https://github.com/kamailio/kamailio/files/4401553/pcscf.log)

#### SIP Traffic

[traffic.zip](https://github.com/kamailio/kamailio/files/4401567/traffic.zip)

### Possible Solutions

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### Additional Information

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

``` (paste your output here) ```

* **Operating System**:

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) -->

``` (paste your output here) ```