### Description

Following this scenario:

Softphone <-> Kamailio <-> Asterisk

1- Softphone registers with kamailio (REGISTER) 2- Kamailio challenges... (401) 3- Softphone registers with kamailio (REGISTER + Auth info) 4- Kamailio accepts (200) 5- If Kamailio accepted, it sends a REGISTER to asterisk (REGISTER) 6- Asterisk challenges... (401) 7- Kamailio authenticates (REGISTER + Auth info) 8- Asterisk accepts (200)

(NOTE: I know you can avoid Asterisk re-requesting for authentication, but in this case it's mandatory.)

kamailio.cfg has this:

``` $var(rip) = $(avp(s:dsp_uri_list){uri.host}); $var(rip_port) = $(avp(s:dsp_uri_list){uri.port}); $uac_req(method)="REGISTER"; $uac_req(auser)=$avp(customer_user); $uac_req(apasswd)=$avp(customer_pass); $uac_req(ruri)="sip:" + $var(rip) + ":" + $var(rip_port); $uac_req(furi)="sip:" + $au + "@" + $var(rip); $uac_req(turi)="sip:" + $au + "@" + $var(rip); $uac_req(hdrs)="Contact: <sip:" + $au + "@X.X.X.X:5060>\r\n"; $uac_req(evroute)=1; if ($sel(contact.expires) != $null) { $uac_req(hdrs)= $uac_req(hdrs) + "Expires: " + $sel(contact.expires) + "\r\n"; } else { $uac_req(hdrs)= $uac_req(hdrs) + "Expires: " + $hdr(Expires) + "\r\n"; } uac_req_send(); ```

and this:

``` # Log replies from uac_req_send() event_route[uac:reply] { xlog("L_NOTICE", "[UAC] - $uac_req(method) request from user $uac_req(auser) to $uac_req(ruri) completed with code: $uac_req(evcode)\n"); } ```

The result:


``` Jul 20 16:49:42 sbc01 sbc[5236]: NOTICE: <script>: [UAC] - REGISTER request from user XXXXX to sip:A.B.C.D:5060 completed with code: 401 Jul 20 16:51:05 sbc01 sbc[5240]: NOTICE: <script>: [UAC] - REGISTER request from user XXXXX to sip:A.B.C.D:5060 completed with code: 401 Jul 20 16:51:49 sbc01 sbc[5241]: NOTICE: <script>: [UAC] - REGISTER request from user XXXXX to sip:A.B.C.D:5060 completed with code: 401 Jul 20 17:00:06 sbc01 sbc[5239]: NOTICE: <script>: [UAC] - REGISTER request from user XXXXX to sip:A.B.C.D:5060 completed with code: 401 Jul 20 17:09:06 sbc01 sbc[5240]: NOTICE: <script>: [UAC] - REGISTER request from user XXXXX to sip:A.B.C.D:5060 completed with code: 401 ```

I was expecting for `$uac_req(evcode)` to be 200, but it's 401.

#### Reproduction

Generate a REGISTER using uaq_send_req() with `auser` and `apasswd` set, and then print the `$uac_req(evcode)` from the corresponding `event_route[]`.

### Possible Solutions

Not sure if the 401 is expected because it was the *first* final response, period.

Or, (when using authentication), it should be updated to 200 or whatever the reply is after sending the REGISTER with auth info.

### Additional Information

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

``` # kamailio -v version: kamailio 5.1.4 (x86_64/linux) flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, 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 ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, 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 6.3.0 ```

* **Operating System**:

``` OS: Debian stretch 9.4

Kernel: Linux kamailio 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 (2018-05-07) x86_64 GNU/Linux ```