### Description
Kamailio v5.5.6 with topos module and postgres DB.
UAC (A) -> Kamailio Registrar (B) -> Kamailio PSTN GW (C) -> PSTN (D)
Call goes from A to D, PSTN sends UPDATE, UPDATE is routed from C to A instead
to B and then to A.
#### Reproduction
Caller calls callee and receives an UPDATE from callee.
In my case it was when the call was routed to voicemail.
#### Log Messages
```
Kamailio takes the wrong route in UPDATE (upstream) case.
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263013]: DEBUG: topos
[tps_msg.c:882]: tps_request_received(): r-uri updated to:
[sip:1234@<UAC-IP>;uniq=B0EB9A84A278626DA07219E2AE01C]
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263013]: DEBUG: topos
[tps_msg.c:187]: tps_add_headers(): adding to headers(0) - [Route:
sip:<<KamailioPSTNgwIP>>;lr=on;ftag=9945501E2B94B883;did=1fc.42f;nat=yes#015#012]
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263013]: DEBUG: topos
[tps_msg.c:187]: tps_add_headers(): adding to headers(0) - [P-SR-XUID:
atpsh-64527b0a-40362-1#015#012]
The right one would be the x_rr (a_rr), but it takes only the s_rr:
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263013]: DEBUG: db_postgres
[km_res.c:234]: db_postgres_convert_rows():
PQgetvalue(0x7fcb4893db50,0,7)=[sip:<KamailioRegistrarIP>;lr=on;ftag=9945501E2B94B883;did=1fc.7b92]
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263013]: DEBUG: db_postgres
[km_res.c:242]: db_postgres_convert_rows(): [0][7]
Column[x_rr]=[sip:<KamailioRegistrarIP>;lr=on;ftag=9945501E2B94B883;did=1fc.7b92]
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263013]: DEBUG: db_postgres
[km_res.c:234]: db_postgres_convert_rows():
PQgetvalue(0x7fcb4893db50,0,8)=[sip:<PSTNgw>:5060;transport=udp;lr;Hpt=8ef8_116;CxtId=3;TRC=ffffffff-ffffffff;X-HwB2bUaCookie=18614]
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263013]: DEBUG: db_postgres
[km_res.c:242]: db_postgres_convert_rows(): [0][8]
Column[y_rr]=[sip:<PSTNgw>:5060;transport=udp;lr;Hpt=8ef8_116;CxtId=3;TRC=ffffffff-ffffffff;X-HwB2bUaCookie=18614]
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263013]: DEBUG: db_postgres
[km_res.c:234]: db_postgres_convert_rows():
PQgetvalue(0x7fcb4893db50,0,9)=[sip:<<KamailioPSTNgwIP>>;lr=on;ftag=9945501E2B94B883;did=1fc.42f;nat=yes]
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263013]: DEBUG: db_postgres
[km_res.c:242]: db_postgres_convert_rows(): [0][9]
Column[s_rr]=[sip:<<KamailioPSTNgwIP>>;lr=on;ftag=9945501E2B94B883;did=1fc.42f;nat=yes]
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263019]: DEBUG: db_postgres
[km_res.c:242]: db_postgres_convert_rows(): [0][10]
Column[a_rr]=[sip:<KamailioRegistrarIP>;lr=on;ftag=9945501E2B94B883;did=1fc.7b92]
May 3 15:23:12 sipproxy /usr/sbin/kamailio[263019]: DEBUG: db_postgres
[km_res.c:234]: db_postgres_convert_rows(): PQgetvalue(0x7fcb4893dbd8,0,11)=[]
```
### Possible Solutions
Respect Route headers for UPDATE messages.
### Additional Information
Current running kamailio 5.5.6 but tried also latest 5.6.4 with same behavior.
```
version: kamailio 5.5.6 (x86_64/linux) 72dbb0
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_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: 72dbb0
compiled on 05:48:21 Apr 27 2023 with gcc 11.3.0
```
* **Operating System**:
```
Distributor ID: Ubuntu
Description: Ubuntu 22.04.2 LTS
Release: 22.04
Codename: jammy
Linux sipproxy 5.15.0-70-generic #77-Ubuntu SMP Tue Mar 21 14:02:37 UTC 2023
x86_64 x86_64 x86_64 GNU/Linux
```
Possibly related bug: https://github.com/kamailio/kamailio/issues/3090
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