### Description

I have configured dispatcher with set: ``` id 1 setid 1 destination "sip:trial.nga911.com" flags 16 priority 0 attrs "" description "trial esrp" ``` Record above from `redis` database

Then kamailio report dispatcher dump ```sh [root@ip-172-22-6-233 config]# kamctl dispatcher dump which: no gdb in (/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/) { "jsonrpc": "2.0", "result": { "NRSETS": 1, "RECORDS": [{ "SET": { "ID": 1, "TARGETS": [{ "DEST": { "URI": "sip:trial.nga911.com", "FLAGS": "AP", "PRIORITY": 0 } }] } }] }, "id": 16982 } ``` Using tcpdump I can see kamailio resolve `A/AAAA` records only for one SRV record. ```sh [root@ip-172-22-6-233 config]# tcpdump -ni any port 53 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes 11:04:23.812111 IP 172.22.6.233.53464 > 172.22.0.2.domain: 30262+ PTR? 233.6.22.172.in-addr.arpa. (43) 11:04:23.812923 IP 172.22.0.2.domain > 172.22.6.233.53464: 30262 1/0/0 PTR ip-172-22-6-233.us-west-1.compute.internal. (99) 11:04:23.813168 IP 172.22.6.233.48244 > 172.22.0.2.domain: 12029+ PTR? 233.6.22.172.in-addr.arpa. (43) 11:04:23.813248 IP 172.22.0.2.domain > 172.22.6.233.48244: 12029 1/0/0 PTR ip-172-22-6-233.us-west-1.compute.internal. (99) 11:04:23.855004 IP 172.22.6.233.45589 > 172.22.0.2.domain: 19167+ A? trial.nga911.com. (34) 11:04:23.856309 IP 172.22.0.2.domain > 172.22.6.233.45589: 19167 0/1/0 (118) 11:04:33.942992 IP 172.22.6.233.56344 > 172.22.0.2.domain: 24272+ SRV? _sip._udp.trial.nga911.com. (44) 11:04:33.944340 IP 172.22.0.2.domain > 172.22.6.233.56344: 24272 2/0/0 SRV proxy-us-west-2-trial-1.nga911.com.:5060 30 30, SRV proxy-us-west-2-trial-0.nga911.com.:5060 30 30 (152) 11:04:33.944580 IP 172.22.6.233.57863 > 172.22.0.2.domain: 27694+ A? proxy-us-west-2-trial-1.nga911.com. (52) 11:04:33.945786 IP 172.22.0.2.domain > 172.22.6.233.57863: 27694 1/0/0 A 172.21.1.32 (68) ``` If host from `A/AAAA` response if failed, then Kamailio do not use other hosts from SRV records.

### Troubleshooting

#### Reproduction

1) configured dispatcher set with `16` flag; 2) SIP URI needs a point to SRV records with two or more backend hosts; 3) start kamailio and check with kamailio use backend; 4) stop used backend; 5) make a call.

#### Debugging Data none

#### Log Messages none

#### SIP Traffic none

### Possible Solutions

not known

### Additional Information

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

``` [root@ip-172-22-6-233 config]# kamailio -v version: kamailio 5.3.4 (x86_64/linux) 117ff9 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: 117ff9 compiled on 15:31:51 May 6 2020 with gcc 8.3.1 ```

* **Operating System**: ``` [root@ip-172-22-6-233 config]# cat /etc/os-release NAME="CentOS Linux" VERSION="8 (Core)" ID="centos" ID_LIKE="rhel fedora" VERSION_ID="8" PLATFORM_ID="platform:el8" PRETTY_NAME="CentOS Linux 8 (Core)" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:centos:centos:8" HOME_URL="https://www.centos.org/" BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-8" CENTOS_MANTISBT_PROJECT_VERSION="8" REDHAT_SUPPORT_PRODUCT="centos" REDHAT_SUPPORT_PRODUCT_VERSION="8" ```