[sr-dev] [kamailio/kamailio] register using uac module is getting send even if send_socket is not in this listening list of kamailio (#2624)

[Surendra Tiwari]

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### Description
I am uac module with database. uacreg table have the send_socket column. i do have 2 kamailio server running. i want only kamailio-1 should send register to uacreg entries. for this i have used send_socket column with socket of kamailio-1. After this we can see both kamailio server sending registration and that's the problem.
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### Troubleshooting

#### Reproduction
loadmodule "uac.so"
modparam("uac","auth_username_avp","$avp(auser)")
modparam("uac","auth_password_avp","$avp(apass)")
modparam("uac","auth_realm_avp","$avp(arealm)")
modparam("uac", "reg_contact_addr", "EXTERNAL_IP:5060")
modparam("uac", "reg_db_url", DBURL)

and use send_socket into uacreg with kamailio-1 socket.
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#### Debugging Data

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#### Log Messages

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#### SIP Traffic

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### Possible Solutions

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### Additional Information

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

```
version: kamailio 5.3.8 (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, 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: unknown 
compiled with gcc 8.3.0
```

* **Operating System**:

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Kernel details (output of `uname -a`)
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```
root at ip-10-0-12-135:/etc/kamailio# uname -a
Linux ip-10-0-12-135 5.3.0-1019-aws #21~18.04.1-Ubuntu SMP Mon May 11 12:33:03 UTC 2020 x86_64 GNU/Linux
```


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