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### Description

<!-- Explain what you did, what you expected to happen, and what actually happened. --> Migrating from Kamailio 5.6.4 IMS to Kamailio 5.7.1 IMS; using Open5GS CN, Amarisoft CallBox eNB, and Huawei UE to implement VoLTE infrastructure for lab testing. VoLTE works in Kamailio 5.6.4 IMS with IPSEC and non-IPSEC UE's; but Kamailio 5.7.1 IMS not working yet with IPSEC UE.

Client and server port settings in P-CSCF kamailio.cfg: ... modparam("ims_ipsec_pcscf", "ipsec_client_port", 5100) modparam("ims_ipsec_pcscf", "ipsec_server_port", 6100) ...

Debug log shows ports are exchanged (server port used as client port and vice-versa): ... Jul 18 12:15:30 corsa03 p-cscf[58287]: DEBUG: ims_ipsec_pcscf [cmd.c:460]: create_ipsec_tunnel(): Creating security associations: Local IP: 10.169.138.17 **port_pc: 6100 port_ps: 5100**; UE IP: 10.46.0.6; port_uc 31409 port_us 31894; spi_pc 4096, spi_ps 4097, spi_uc 48734730, spi_us 96335982, alg hmac-md5-96, ealg null ...

### Troubleshooting spi_add function definition and declaration differ:

From src/modules/ims_ipsec_pcscf/spi_list.h: int spi_add(spi_list_t *list, uint32_t spi_cid, uint32_t spi_sid, **uint16_t cport, uint16_t sport**);

But in spi_list.c: int spi_add(spi_list_t *list, uint32_t spi_cid, uint32_t spi_sid, **uint16_t sport, uint16_t cport**)

#### Reproduction

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#### Debugging Data

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gdb /path/to/kamailio /path/to/corefile bt full info locals list

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``` (paste your debugging data here) ```

#### Log Messages

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``` (paste your log messages here) ```

#### SIP Traffic

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` (paste your sip traffic here) ```

### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. --> Applied following patch:

--- a/src/modules/ims_ipsec_pcscf/spi_list.c 2023-06-28 09:40:45.000000000 +0200 +++ b/src/modules/ims_ipsec_pcscf/spi_list.c 2023-07-18 16:12:11.166476076 +0200 @@ -51,7 +51,7 @@ }

int spi_add(spi_list_t *list, uint32_t spi_cid, uint32_t spi_sid, - uint16_t sport, uint16_t cport) + uint16_t cport, uint16_t sport) { if(!list) { return 1;

Log now shows expected client and server port: ... Jul 18 17:45:22 corsa03 p-cscf[82076]: DEBUG: ims_ipsec_pcscf [cmd.c:460]: create_ipsec_tunnel(): Creating security associations: Local IP: 10.169.138.17 **port_pc: 5100 port_ps: 6100**; UE IP: 10.46.0.6; port_uc 31411 port_us 31896; spi_pc 4096, spi_ps 4097, spi_uc 48734732, spi_us 96335984, alg hmac-md5-96, ealg null ... ### Additional Information

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

``` version: kamailio 5.7.1 (x86_64/linux) flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, 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_BLOCKLIST, 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: unknown compiled on 16:22:26 Jul 18 2023 with x86_64-pc-linux-gnu-gcc 13.1.1 ```

* **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 `lsb_release -a` and `uname -a`) -->

``` Linux corsa03 6.4.2-gentoo-x86_64 #2 SMP PREEMPT_DYNAMIC Tue Jul 11 14:35:45 CEST 2023 x86_64 AMD EPYC 7513 32-Core Processor AuthenticAMD GNU/Linux ```